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Battery at 98% as soon as I unplugged

I installed the Serendipity Rom a few days ago and I noticed the battery goes down to 98% as soon as I unplugged. Some occassions I overcharge an hour after it has 100%, some occassions I unplugged as soon as it said 100%. Charged it with the phone on, and some occassions the phone off. I tried to use bump charging, but still the same issue.
I also notice the battery life is not as good as stock either. I used a Stock rogers froyo before.
Any ideas what might be the cause of this? How I use the phone is the same way. I think its the phone being on standby that's causing the drain. Usually when I sleep the phone goes down by about 2-3% in standy mode by the next morning. With this ROM it goes down like 8% during sleep.
Any ideas?
Edit: I did not realize this was in the development section. It was intended to be in Q/A

Run battery dead and do a full uninterrupted charge to 100%. Turn off any features or apps that would blatently be killing battery as well.

likiud said:
I installed the Serendipity Rom a few days ago and I noticed the battery goes down to 98% as soon as I unplugged. Some occassions I overcharge an hour after it has 100%, some occassions I unplugged as soon as it said 100%. Charged it with the phone on, and some occassions the phone off. I tried to use bump charging, but still the same issue.
I also notice the battery life is not as good as stock either. I used a Stock rogers froyo before.
Any ideas what might be the cause of this? How I use the phone is the same way. I think its the phone being on standby that's causing the drain. Usually when I sleep the phone goes down by about 2-3% in standy mode by the next morning. With this ROM it goes down like 8% during sleep.
Any ideas?
Click to expand...
Click to collapse
It's working properly. When 100% charge is reached the controller stops charging to prevent damage to the battery. It then lets the battery charge "float" down a few points before charging back up to 100% again. Depending on when you happen to unplug in one of these cycles, you might be anywhere between 97-98 and 100% charge.
This might be a better question for another section.

From what I understand its an issue with 2.2.1. There is nothing you can do to fix it. I also don't get great battery life with serendipity. I switched to the suckerpunch kernel to undervolt. Seems to be working out pretty well
Sent from my SAMSUNG-SGH-I897 using XDA App

Smallsmx3 said:
From what I understand its an issue with 2.2.1. There is nothing you can do to fix it. I also don't get great battery life with serendipity. I switched to the suckerpunch kernel to undervolt. Seems to be working out pretty well
Sent from my SAMSUNG-SGH-I897 using XDA App
Click to expand...
Click to collapse
It's not an issue like you said. It's a feature. Read the previous post.

The dropping to 98% is a Samsung thing, it's supposed to increase the life of your battery.

Yeah, i heard it does that to keep it from over charging when left plugged in.

ls377 said:
The dropping to 98% is a Samsung thing, it's supposed to increase the life of your battery.
Click to expand...
Click to collapse
It's a Li-on thing, not just Samsung. Same thing occurs with all lithium battery chargers (other phones, cameras, laptops) to prevent overcharging. Some other chargers kick back in as soon as it drops to 99% though, whereas this one does not.

ninjuh said:
Run battery dead and do a full uninterrupted charge to 100%. Turn off any features or apps that would blatently be killing battery as well.
Click to expand...
Click to collapse
That's what I did. The apps and features were the same as it was with the rogers stock froyo. I'll see if the battery gets better the next few days.

likiud said:
That's what I did. The apps and features were the same as it was with the rogers stock froyo. I'll see if the battery gets better the next few days.
Click to expand...
Click to collapse
That rogers stock must be nice, ATT stock gives you 50% battery in 4-5 hours :/

moved to general as not android development

likiud said:
I installed the Serendipity Rom a few days ago and I noticed the battery goes down to 98% as soon as I unplugged. Some occassions I overcharge an hour after it has 100%, some occassions I unplugged as soon as it said 100%. Charged it with the phone on, and some occassions the phone off. I tried to use bump charging, but still the same issue.
I also notice the battery life is not as good as stock either. I used a Stock rogers froyo before.
Any ideas what might be the cause of this? How I use the phone is the same way. I think its the phone being on standby that's causing the drain. Usually when I sleep the phone goes down by about 2-3% in standy mode by the next morning. With this ROM it goes down like 8% during sleep.
Any ideas?
Click to expand...
Click to collapse
You can try this.
After full charged message comes up, unplug power cord, battery from 100% drop to 98% or 96% immediately.
Then plug power cord again, charge again until fully charge (again).
Unplug power cord, see if battery level can hold on 100%
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Why don't people read in the threads that they get Rims from. This has been covered numerous times.
Sent from my Captivate running Cezar's Continuum v.2.1 with SuckerPunch kernel.

Unplug, replug worked great. Thanks!

johan8 said:
You can try this.
After full charged message comes up, unplug power cord, battery from 100% drop to 98% or 96% immediately.
Then plug power cord again, charge again until fully charge (again).
Unplug power cord, see if battery level can hold on 100%
Click to expand...
Click to collapse
You might as well have a messaging phone if your never even going to turn the screen on

Im having this problem running di11is 6.0 rom...I've read the posts and everybody claims BETTER battery life with the rom...if I use it it drops really quick...I just text and check youtube for about 5 minutes and it drops about 2%...if it sits undisturbed it doesn't drop fast at all
Sent from my SAMSUNG-SGH-I897 using XDA App

newter55 said:
You might as well have a messaging phone if your never even going to turn the screen on
Click to expand...
Click to collapse
What do you mean ?
My screen use auto brightness.

I get the same problem. But what I do is that I leave it for an extra 30min even after it says it's fully charged, that way when i unplug it, it will still be full.

Well, to wipe data and wipe factory reset before you flash a new rom may be helpful. And also, just ignore the 98% bat thing. It really doesn't matter.

johan8 said:
What do you mean ?
My screen use auto brightness.
Click to expand...
Click to collapse
The comment was in regards to your screen shot. What is the display time? Never seen display in the 60s personally...or even 70s for that matter.

Battery only charges to 96%

Exactly what the title says. The phone says it has charged completely but the battery is only at 96%. I'm currently draining the battery and I'm going to recharge it, but is this normal? I've had this phone for six months.

souvik1997 said:
Exactly what the title says. The phone says it has charged completely but the battery is only at 96%. I'm currently draining the battery and I'm going to recharge it, but is this normal? I've had this phone for six months.
Click to expand...
Click to collapse
What rom are you on? Wipe your battery stats and cycle it a couple of times and eventually it'll hit 100 or 99 once you unplug

This happens to me as well. if you leave it long enough it will go to 100. it is a calibration error and will not actually hurt battery life, just how it is reported.

souvik1997 said:
Exactly what the title says. The phone says it has charged completely but the battery is only at 96%. I'm currently draining the battery and I'm going to recharge it, but is this normal? I've had this phone for six months.
Click to expand...
Click to collapse
As Jce9182 asked, which rom are you running, and if you're not running any custom rom, are you at least rooted? The issue here sounds like it is most definitely a battery reporting error. This can be fixed by using an app from the market like Battery Calibration. You can also try the following with use of the market app for calibrating the battery. It's best to complete this procedure in the evening before going to bed, so you can leave it at 100% overnight and check in the morning if the issue has been resolved. The whole procedure along with recalibration might take up to 5-6 hours or more!
1. Take the case off your phone (if you're using one, as one of the latter steps involves taking the battery out from the phone while it's plugged in. Make sure your case won't stand in the way.)
2. Install Battery Calibration app from the market: Find it here!
3. Plug in your phone to charge while it's on, and wait until it gets to a 100% (or 96% as it appears in your situation)
4. When the charged, open the Battery Calibration app and look up what the charge is in mV while at fully charged. Write it down.
5. Discharge your phone completely until it shuts off. A good way of doing this quickly is by turning on WiFi, and a video player.
6. Without turning on the phone plug it into a wall charger and let it get to 100% (or 96% if this is all you will be able to see before finishing these steps)
7. When it's charged, without unplugging it from the wall charger, take off the battery cover, and take the battery out. Your phone will "reboot" and show a Missing Battery icon.
8. Without unplugging the phone from the wall charger or turning it on, put the battery back in and wait until the phone recognizes the battery.
9. Your battery should now be recognized by the phone, and showing a charge % significantly lower than 100%. Mine showed only 5%.
10. Let it sit there charging for 2-3 hours. My phone wouldn't charge past 10%, but yours might. The numbers don't matter much as the phone is definitely getting additional charge that could have been lost while flashing ROMs, etc.
11. After 2-3 hours, turn the phone on while holding the volume down button and get into CWM. Do not disconnect it from the charger still!
12. Wipe battery stats in CWM, reboot. Do not disconnect it from the charger still!
13. When the phone turns on, go into Battery Calibration app again and look up your MV numbers- if you were like me, they should be significantly higher than before. Do not disconnect it from the charger still!
14. Before going to sleep - Install Watchdog Task Manager from the market. Go into it's preferences, set CPU threshold to 20%, check "Include phone processes", check "Monitor phone processes", check "Display all phone processes", set system CPU threshhold to 20% as well. Do not disconnect it from the charger still!
15. Make sure your wifi and data connections are off. Now finally unplug the phone from the charger. Go to bed, let your phone sleep too.
16. Success! Next morning check where your battery % is at and if you followed the instructions correctly / got lucky like me, your battery life should be 90% or more. I went to bed with 98% and woke up to 94%. So, I consider this mission a success.
(Your general battery capacity should have increased, even if something still was draining the battery, you will be able to find the infringing process in WatchDog with the settings we've set up in step 14)
Hope this helps... :good:

Apex_Strider said:
2. Install Battery Calibration app from the market: Find it here!
4. When the charged, open the Battery Calibration app and look up what the charge is in mV while at fully charged. Write it down.
13. When the phone turns on, go into Battery Calibration app again and look up your MV numbers- if you were like me, they should be significantly higher than before. Do not disconnect it from the charger still!
Click to expand...
Click to collapse
Should i click "calibration" on battery calibration app?
And what is the MV number that you got after all?
Thanks

kojitabe said:
Should i click "calibration" on battery calibration app?
And what is the MV number that you got after all?
Thanks
Click to expand...
Click to collapse
Click "calibrate" after the phone has been on the charger (wall, not USB to PC charge!) For several hours -preferrably after charging all night- and calibrate using the app in the morning.
The Mv I get at full charge is in the neighborhood of 4351-4353Mv or so:
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Sent from my MB865 using xda premium

[Q] At a loss

I've had my phone for quite a while now and played around with it a lot. Originally, I power cycled the battery, thinking it was the best thing to do. To my dismay, my battery barely lasted me through the day. No matter what I did, I could not get it to match what some other people indicated they get out of their battery - 35-40 hrs or more. I rooted, dimmed the display, installed JuiceDefender, uninstalled Juice Defender, unrooted, power cycled 3 or 4 times again...
...and then one day I woke up, probably three month into me having the phone, and the phone was amazing. I came home from work at 5 pm with 72% still on the battery. I was in heaven. Until a month ago.
A month ago, I accidentally let the battery run out completely. I had done that before (though I try not to) so I thought it wasn't a big deal. I hadn't installed any new apps or done anything differently, but now my battery will hardly last me through the day again. My once amazing battery is less then average again.
I've tried everything you normally read on forums. I have a good idea of how to save battery life - it's set to Maximum Battery Savings - and have tried all of the stuff that is typically recommended. I've not killed apps, but I don't think that would really help to begin with anyway.
So...here I am to ask if anybody has any other ideas for me. Anything at all? The thing is...I didn't change anything when my battery was cut down to less than normal size!!
Help?!?

Rogue app update. Try bad ass battery monitor should give you an idea which one
Motorola lied and I'm still locked mb865

Thanks, I will try that. I tried Battery Monitor, which told me AT&T Address Book was a main culprit. Doubt that since I could never do too much about that one...

This is what you'll see under the apps tab. Much more useful than others I've tried.
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Motorola lied and I'm still locked mb865

So right off the bat, here is what it says:
Phone 29.3%
Screen 2.1%
Phone Radio 45%
Wifi Active 10.1%
Held Awake 2.6%
Bluetooth 0.0%
App Usage 11.1%
For Phone Radio, the Signal Strength from 1-5 has 2 listed as 72%
For App usage there's not much beside the kernel to report.
How does that help me? My reception at work is always iffy - but it's always been that way so that cannot be the culprit.

Pilgrimtozion said:
I've had my phone for quite a while now and played around with it a lot. Originally, I power cycled the battery, thinking it was the best thing to do. To my dismay, my battery barely lasted me through the day. No matter what I did, I could not get it to match what some other people indicated they get out of their battery - 35-40 hrs or more. I rooted, dimmed the display, installed JuiceDefender, uninstalled Juice Defender, unrooted, power cycled 3 or 4 times again...
...and then one day I woke up, probably three month into me having the phone, and the phone was amazing. I came home from work at 5 pm with 72% still on the battery. I was in heaven. Until a month ago.
A month ago, I accidentally let the battery run out completely. I had done that before (though I try not to) so I thought it wasn't a big deal. I hadn't installed any new apps or done anything differently, but now my battery will hardly last me through the day again. My once amazing battery is less then average again.
I've tried everything you normally read on forums. I have a good idea of how to save battery life - it's set to Maximum Battery Savings - and have tried all of the stuff that is typically recommended. I've not killed apps, but I don't think that would really help to begin with anyway.
So...here I am to ask if anybody has any other ideas for me. Anything at all? The thing is...I didn't change anything when my battery was cut down to less than normal size!!
Help?!?
Click to expand...
Click to collapse
Draining your battery until the device powers down isn't something to worry about. The battery can be "seasoned" when you first pull it out of the box by allowing it to drain until power down, then while still powered off, plug in your charger without powering the phone back up, and allowing it to charge fully, then power on/drain to power down/charge while powered off/power back on repeatedly three to four times. This is a common practice for some people (perhaps as neurotic about such things as myself) to make sure your battery is getting full charging cycles.
Partial charging cycles won't hurt anything either. For instance, you can charge fully, then at some point during the day, plug your charger in and charge it from say, 70& to 100% without any issues. The device has built-in programming that will not allow for overcharging, which some users seem to have concern about. That being so, you can plug in your phone, leave it charging (even while at 100%) for as long as you see fit without having any "overcharging" to the battery occurring.
Sounds like you do have a rogue app that is consuming battery, so that would be the first thing to investigate -as mtlion stated. There are some other steps that you can do, to ensure your battery is a full charge, as there are some instances where after flashing roms you can lose some of your battery reporting accuracy or even some battery life. But, see if you can track down which (if any) apps are consuming your battery, and that is an easy fix. Also, if you have questionable radio signal reception, that counld be a contributing factor as well. The phone will constantly look for a signal, and if it loses signal, start the scanning process until it can connect again. Though you may not have noticed this at first, this could also be the reason your battery consumption is so high.

If you experienced such a dramatic change in battery percentages after a full cycle, then could it be possible that the percentages were disoriented and you were mistaken into thinking you had a very high amount of charge left when you really didn't? It seems unlikely, but given the situation you described this fits.
Maybe you had the same battery performance all along, and the 70% showed when you were actually about to run out, but you never found out because you always charged before the bug revealed itself, and the bug was finally reset after your phone was drained.

I wish I could say that it was mistaken all along but I actually went two days without charging regularly. I'm trying to eliminate possibilities and so far have had a little bit of success. The rogue app does sound plausible.
So power cycling now really won't make a difference?

Pilgrimtozion said:
I wish I could say that it was mistaken all along but I actually went two days without charging regularly. I'm trying to eliminate possibilities and so far have had a little bit of success. The rogue app does sound plausible.
So power cycling now really won't make a difference?
Click to expand...
Click to collapse
If, after rooting or more likely that case after flashing a new rom, you often have battery reporting errors (as mentioned above), and re-calibrating the battery along with some steps I will outline for you below will ensure that your battery is getting a full charge, and the battery reporting accuracy is right on. As far as power cycling, I don't know that it does much good. I run my device in performance mode all the time, and with a CPU overclock of 1.25GHz and various tweaks, I have about a day an a half to a day and a quarter of full runtime from my battery. This is with moderate to heavy usage (calls, emailing, text, gaming, web browsing, etc.) so you should have no problems getting acceptable battery performance after following these steps:
1. Take the case off your Atrix 2 (one of the latter steps involves taking the battery out from the phone while it's plugged in. Make sure your case won't stand in the way.)
2. Install Battery Calibration app from the market
3. Plug in your Atrix 2 to charge while it's on, wait till it gets to a 100%
4. When the charge is 100%, open the BatteryCalibration app and lookup what the charge is in MV while at 100%. Write it down.
My Atrix 2 was showing ~3400MV while at 100%, which is definitely not the maximum capacity.
5. Discharge your Atrix 2 completely until it shuts off.
A good way of doing this quickly is by turning on wifi, and a video player.
6. Without turning on the phone plug it into a wall charger and let it get to 100%
7. When it's at 100%, without unplugging it from the wall charger, take off the battery cover, and take the battery out.
Your phone will "reboot" and show a Missing Battery icon.
8. Without unplugging the phone from the wall charger or turning it on, put the battery back in and wait until the phone recognizes the battery.
9. Your battery should now be recognized by the phone, and showing a charge % significantly lower than 100%.
Mine showed only 5%.
10. Let it sit there charging for 2-3 hours (or more).
My phone wouldn't charge past 10%, but yours might. The numbers don't matter much as the phone is definitely getting additional charge that could have been lost while flashing ROMs, etc.
11. After 2-3 hours (or more), turn the phone on while holding the volume down button and get into CWM.
Do not disconnect it from the charger still!
12. Wipe battery stats in CWM, reboot.
Do not disconnect it from the charger still!
13. When the phone turns on, go into Battery Calibration app again and look up your MV numbers -if you were like me, they should be significantly higher than before. After this whole process I had 4351MV at 100%, comparing to 3400MV before calibration.
Do not disconnect it from the charger still!
14. Before going to sleep - Install Watchdog Task Manager Lite from the market. Go into it's preferences, set CPU threshhold to 20%, check "Include phone processes", check "Monitor phone processes", check "Display all phone processes", set system CPU threshhold to 20% as well.
Do not disconnect it from the charger still!
15. Make sure your wifi and data connections are off. Now finally unplug the phone from the charger.
Go to bed, let your phone sleep too.
16. Success! Next morning check where your battery % is at and if you followed the instructions correctly / got lucky like me, your battery life should be 90% or more.
I went to bed with 98% and woke up to 94%. So, I consider this mission a success.

Does it make any difference whether I'm currently rooted or not? Cause I'm not...

Had the same issue and the only thing that really worked for me was to wipe the battery cache..... There are apps on the market but did not do the job well like this method.....
Fully charge phone
reboot with bootstrapper (recovery)
go to advanced menu
and then click wipe battery stats
Hope it works for you!!!!!

Pilgrimtozion said:
Does it make any difference whether I'm currently rooted or not? Cause I'm not...
Click to expand...
Click to collapse
The Battery Calibration app requires root permissions. You can always root using the "one-click-root" method, run the above steps, and then "click-to-unroot" using the .bat files within the root folder. It's easy, and takes no time at all to do so. But, it is all in how much fuss you want to put into solving your problem...

Once again it sounds like I need to root my device. Correct assumption?
hankbizzo5 said:
Had the same issue and the only thing that really worked for me was to wipe the battery cache..... There are apps on the market but did not do the job well like this method.....
Fully charge phone
reboot with bootstrapper (recovery)
go to advanced menu
and then click wipe battery stats
Hope it works for you!!!!!
Click to expand...
Click to collapse

Pilgrimtozion said:
Once again it sounds like I need to root my device. Correct assumption?
Click to expand...
Click to collapse
For the CWM Recovery wipe, yes you will need to be rooted.
Sent from my MB865 using xda premium

Rooted, wiped battery stats, and it went from less than 95% up to 98%. Interesting phenomenon. Thank you all heaps! I'll let you know if I run into any more issues.

Pilgrimtozion said:
Rooted, wiped battery stats, and it went from less than 95% up to 98%. Interesting phenomenon. Thank you all heaps! I'll let you know if I run into any more issues.
Click to expand...
Click to collapse
Glad you got things working!

Recalibrated battery this morning when my phone was fully charged. Not seeing much improvement, but I'm letting it run out and then charging it to 100%. Or should I actually be going through the 16 step process described above?

Pilgrimtozion said:
Recalibrated battery this morning when my phone was fully charged. Not seeing much improvement, but I'm letting it run out and then charging it to 100%. Or should I actually be going through the 16 step process described above?
Click to expand...
Click to collapse
You can try either, but calibration is obviously the less time consuming option. It may take a few "full charge to full drain" discharges to get the battery back to an acceptable capacity...
Sent from my MB865 using xda premium

Well, it's a few days later and nothing has made a significant difference. I've been using Badass Battery Monitor to find apps that use an exorbitant amount of battery, but even that has not made a great difference. I've deleted Instagram, a Bible app, a banking App, Temple Run (had a large Sensor Time used), but so far to no avail. It still shows that since I unplugged my phone less than 5 hours ago, the android system has a sensor time used of 1h57m - processes included are servicemanager, com.android.settings, and mid.
Battery Calibration has caused the max charge to be around 4350, but it has not impacted my actual battery life any. I drained it completely, recharged it, did that a few times, then just charged it when at 30-35%, nothing, nothing, nothing.
Any more ideas?

Nobody? At all?
Sent from my MB865 using xda app-developers app

[GUIDE] How to Callibrate Battery On Your Device [ROOT/NON-ROOT]

​
Battery problems are among the biggest concerns for smartphone users, which is why XDA offers so many useful tips for solving battery drain issues. If you notice that your battery performance and duration has decreased, it could be time to calibrate your battery. Today i will explain what battery calibration is, how to tell if you need to do it and how to do it, with or without root access.
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How do I know whether my battery is the problem?
First of all you need to identify why your battery performance has decreased: is it the Android system's calibration or the battery itself? We'll move onto calibration in the sections below, but you should check if your battery itself is damaged first.
If your phone has a removable battery cover, turn of your phone, remove the cover and inspect the battery. Look for bulges or leaks. In the image below, the battery of Galaxy S6 battery swelled up and pushed the non-removable back off the phone. If your phone also has a non-removable battery, keep an eye out for similar occurences. If your phone doesn't sit flat on the table anymore, that could also be a sign of a swollen battery.
If you're satisfied that the battery itself is not the problem, you can move on to the steps below. If you think your battery might be the problem (even after trying to recalibrate it), i would advise you to take it to a repair shop for an expert's opinion. If it turns out you need to replace the battery, go with an original or reliable third-party battery. Scrimping on a cheap knock-off battery only leads to more headaches in the long run.
Keep in mind that there are plenty of other things that can cause a battery to malfunction.
If you've just updated the firmware on your phone, battery drain is a common complaint, so you might want to clear the cache partition on your device.
What is calibrating a battery?
The Android operating system has a feature called Battery Stats, which keeps track of battery capacity, when it is full or empty. The problem is that it sometimes becomes corrupted and starts displaying data that isn’t real, which, for example, causes the phone to turn off before it reaches 0 percent. Calibrating your Android battery simply means getting the Android OS to correct this information so it is reflective of your actual battery levels once again.
It's important to understand that you can't actually calibrate the battery: it is, after all, just a cell that stores power and discharges. However, lithium-ion batteries do include a printed circuit board (PCB), which serves as a protection switch to stop them exploding or deep discharging.
Smartphone battery myths
Lithium-ion batteries don't have a memory so there's not much you need to do to keep them running as they should. The problem lies with how the Android system reads and displays the current capacity of the battery, not the battery itself.
The same goes for the myth that deleting the batterystats.bin file will magically recalibrate your battery. That file (on most devices anyway) simply stores data about what is using the battery when it is not being charged. It is also reset every time a battery is charged to over 80 percent and then disconnected.
The batterystats.bin file contains the info you see made prettier in the Battery section of your phone: it's the Android system keeping track of your battery's usage, per charge cycle. When we talk about battery calibration, it's the percentage meter that gets out of whack, and that is what we need to fix.
How to calibrate an Android device battery without root access
The old 'fully charge and discharge' approach stands as one of the simplest ways to 'recalibrate' your Android battery. But if your phone battery is causing you real problems, it's worth taking the risk.
Method 1
1. Discharge your phone fully until it turns itself off.
2. Turn it on again and let it turn itself off.
3. Plug your phone into a charger and, without turning it on, let it charge until the on-screen or LED indicator says 100 percent.
4. Unplug your charger.
5. Turn your phone on. It's likely that the battery indicator won't say 100 percent, so plug the charger back in (leave your phone on) and continue charging until it says 100 percent on-screen as well.
6. Unplug your phone and restart it. If it doesn't say 100 percent plug the charger back in until it says 100 percent on screen.
7. Repeat this cycle until it says 100 percent (or as close as you think it's going to get) when you start it up without being plugged in.
8. Now, let your battery discharge all the way down to 0 percent and let your phone turn off again.
9. Fully charge the battery one more time without interruption and you should have reset the Android system's battery percentage.
Remember that it is not recommended to perform this process all the time. Even when your battery is so dead your phone won't even turn on, your battery still has enough reserve charge to avoid system damage. But you don't want to poke the tiger with a stick. Perform this process once every three months at the most. If it is required more often than that you have bigger problems at hand.
Put plainly: fully discharging a battery is bad for it. Trying to overload a battery is also bad for it. The good news is that charging batteries automatically shut off when their safe limit is reached and there's always a little in reserve even if your phone won't start. But again: do this only when really necessary, because it does have a negative impact on battery life.
How to calibrate Android device battery with root access
Even though I'm not convinced that clearing the batterystats.bin file has any meaningful effect on how the Android system reports remaining battery charge, there are those who swear by this method.
So in the interests of fairness, we've included the process for you here (it is true that different manufacturers use the batterystats.bin file for different things). It's basically the same process as above but with the added step of a root-enabled app.
Method 2
1. Discharge your phone fully until it turns itself off.
2. Turn it on and let it turn off again.
3. Plug your phone into a charger and, without turning it on, let it charge until the on-screen or LED indicator says 100 percent.
4. Unplug your charger.
5. Turn your phone on. It's likely that the battery indicator won't say 100 percent, so plug the charger back in (leave your phone on) and continue charging until it says 100 percent on the screen as well.
6. Unplug your phone and restart it. If it doesn't say 100 percent, plug the charger back in until it says 100 percent on screen.
7. You want to repeat this cycle until it says 100 percent (or as close as you think it's going to get) when you start it up without being plugged in.
8. Now, install the Battery Calibration app and, before you launch it, make sure your battery is at 100 percent again, then restart.
9. Immediately launch the app and recalibrate your battery.
10. Once you've calibrated your battery, discharge it all the way down to 0 percent and let your phone turn off again.
11. Fully charge the battery one more time without interruption while it's switched off, and the Android system's battery percentage will be reset.
That's it. Have you tried any of these methods? Do you know an alternate way to fix battery problems? Let me know in the comments.
Source : AndroidPit

When you say "allow the battery to discharge", I.e. drain to zero, must leave my phone idle for a long as it takes to drain naturally, or can I run a battery-heavy app to speed the draining?
Also, what is the best charger to use for my phone, and how much would it cost to replace the battery?
Thank you

AndroidAssociated said:
When you say "allow the battery to discharge", I.e. drain to zero, must leave my phone idle for a long as it takes to drain naturally, or can I run a battery-heavy app to speed the draining?
Also, what is the best charger to use for my phone, and how much would it cost to replace the battery?
Thank you
Click to expand...
Click to collapse
You can use the phone any way you want, just don't charge it in between.
Charger and cost would be different for different devices, so ask someone who has your device.

anandmore said:
You can use the phone any way you want, just don't charge it in between.
Charger and cost would be different for different devices, so ask someone who has your device.
Click to expand...
Click to collapse
Thank you, it worked well.
Now I am having difficulty rooting my device. I made a thread and am hoping I receive a solution.

When you do the first step is with the phone turned off, then you do the plug and unplug until is 100% and you fully discharge the phone (until it's off). After that, the next charge must be with the phone on or off? (Just to be clear, I'm talking about step 9)

GermanGuellB said:
When you do the first step is with the phone turned off, then you do the plug and unplug until is 100% and you fully discharge the phone (until it's off). After that, the next charge must be with the phone on or off? (Just to be clear, I'm talking about step 9)
Click to expand...
Click to collapse
with phone on.

anandmore said:
with phone on.
Click to expand...
Click to collapse
And how long is the charging time, until it reaches 100% or an exact number of hours (i.e. 8 hours or something like that)? Again, talking about step nine

Thanks. Will try the same.
That second photo of S6 looks scarier for a phone with non-removable batteries. Is that the case with most of the phones with non-removable batteries?

anandmore said:
with phone on.
Click to expand...
Click to collapse
This is confusing to me... In the root steps (step 11), it specifically says to charge it with the phone *off*. So after using the device until it shuts off, should you recharge it to full while the device is on or off? Or is it different depending on whether your device is rooted or not?
The way I understand it - step 9 (which is what the poster was questioning) in the non-rooted steps is the same as step 11 in the rooted steps - and that is where I'm seeing conflicting information with the answer you gave that poster...
Can you please clarify?
Thank you.

Thanks a lot for this tricks, i will try it.

Letting your phone discharge to 0, can damage the battery!?

my phone shut down before 0%.i.e somewhere between 0to 5%.
its swicthed off directly without showing brand logo

akashnaik1996 said:
my phone shut down before 0%.i.e somewhere between 0to 5%.
its swicthed off directly without showing brand logo
Click to expand...
Click to collapse
So reboot the phone, then wait that it shutdown itself, then try to reboot it again.
Repeat it until you can't reboot the phone.

Sorry to dig up an old thread but ive tried the battery calibration thingy and my phone got stuck on 100% after every time i did this method of letting it die completely and leaving it off and charging overnight, when i turned it back on it stayed at 100% for an hour of heavy use. I had to do several restarts and cache wipes to get it fixed, but battery percentage still off by 5-6% when the phone is off vs when its on, it shows two entirely different percentages when plugged in and when turned on.

Didn't work Help
I tried doing the method but my phone doesn't start up again after it dies
I tried another method a month ago and still didnt work

In the first step you mention that we must allow the battery to fully discharge, now does that mean that we discharge it until the phone indicator shows 0 and shuts down or we keep turning the phone on until it does not turn on anymore. Because I think my battery still has substantial amount of charge even when the phone is showing it as 0.

Hi!
this guide is still valid? as we are today on 2018 and OREO era?

riccetto80 said:
Hi!
this guide is still valid? as we are today on 2018 and OREO era?
Click to expand...
Click to collapse
Yes. Totally.

@helblazer with Non-Root you said on 9 step charges battery again to 100% & you have battery reset, and on post #7 you answer we should charges phone while phone is On, how we charge phone while its on, since its already off on step 8,
8. Now, let your battery discharge all the way down to 0 percent and let your phone turn off again.
9. Fully charge the battery one more time without interruption and you should have reset the Android system's battery percentage.
you might want o answer this question again, after 8th step, phone batter is 0% & it auto off, we need to charge it with phone off or on? if on how it can on if battery is 0% & it auto off,
i am waiting for your reply since i am now on 8th step & need to do step 9,
Thanks.

65% battery drain when phone completely off

So last night my phone was at around 75% before heading to sleep, I woke up this morning to find, after turning it on (it was completely off) that it was at 10%. I did do an update several days ago, but I'm worried as my battery has been iffy lately. So my question is, has anyonr else experienced this and had it as an isolated issue that they didn't have to deal with again, or should I be worried about my battery? I've never seen anyone report this issue on an S7 before.
XDA won't let me post an image or link until I make 10 posts, so I can't post the graph, sorry. It just shows a giant gap for when it was off, and the line starting significantly lower than where it startrd before the graph.
thanks in advance

Must have water damage on your mother board ..due to which battery drain occurs ..in night mine only drains 1%

danysonu said:
Must have water damage on your mother board ..due to which battery drain occurs ..in night mine only drains 1%
Click to expand...
Click to collapse
I don't think it's water damage as I very rarely bring this thing around water. Also, it didn't happen last night, so that's good.

Put it down to the phone not fully powering off, and instead getting stuck in a SoD (Sleep of Death), used to happen with the ASUS Transformer a lot, looks like it's powered off, but it's still running and you end up with a dead battery the next day

*Detection* said:
Put it down to the phone not fully powering off, and instead getting stuck in a SoD (Sleep of Death), used to happen with the ASUS Transformer a lot, looks like it's powered off, but it's still running and you end up with a dead battery the next day
Click to expand...
Click to collapse
Interesting, does battery data not at all record during that point, as the graph suggests?
I should mention I was able to turn it on like normal in the morning.

Lalam24 said:
Interesting, does battery data not at all record during that point, as the graph suggests?
I should mention I was able to turn it on like normal in the morning.
Click to expand...
Click to collapse
It didn't with the Transformer, for all intents and purposes it thought it was off but was stuck in limbo, I think the CPU gets hammered during that time too as the battery would not drain almost fully by just leaving it on idle overnight
Being able to turn it on normally is different, but I guess it's a different device, I had to hold the power button of the Transformer to shut it off completely before powering back on if it hadn't 100% drained the battery, but generally it had (Both batteries, dock and tablet)

*Detection* said:
It didn't with the Transformer, for all intents and purposes it thought it was off but was stuck in limbo, I think the CPU gets hammered during that time too as the battery would not drain almost fully by just leaving it on idle overnight
Being able to turn it on normally is different, but I guess it's a different device, I had to hold the power button of the Transformer to shut it off completely before powering back on if it hadn't 100% drained the battery, but generally it had (Both batteries, dock and tablet)
Click to expand...
Click to collapse
Do I have any way of finding out if this was the cause other than assuming?

Lalam24 said:
Do I have any way of finding out if this was the cause other than assuming?
Click to expand...
Click to collapse
None that I know, if it was still in that state a logcat might help but chances are it is not in any state that would be logging anything tbh
Other possibility is a bad battery, but seems strange it would happen when the phone was off, but I guess anything is possible if the hardware is faulty
The gap in the battery stats graph is normal when you turn the phone off, as the graph is showing time scales, you leave it off for 8 hours there will be an 8 hour time gap, happens with mine when I turn it off too

*Detection* said:
None that I know, if it was still in that state a logcat might help but chances are it is not in any state that would be logging anything tbh
Other possibility is a bad battery, but seems strange it would happen when the phone was off, but I guess anything is possible if the hardware is faulty
The gap in the battery stats graph is normal when you turn the phone off, as the graph is showing time scales, you leave it off for 8 hours there will be an 8 hour time gap, happens with mine when I turn it off too
Click to expand...
Click to collapse
I know the gap is normal, just the gap with the huge difference in percentage from each sidr is what I'm talking about.
Anyway thanks for the suggestion, still curious to see if this ever happened to anyone else and they just didn't report it.

Lalam24 said:
I know the gap is normal, just the gap with the huge difference in percentage from each sidr is what I'm talking about.
Anyway thanks for the suggestion, still curious to see if this ever happened to anyone else and they just didn't report it.
Click to expand...
Click to collapse
Yea the huge % drop is definitely not normal, even left turned on with all radios enabled wouldn't do that, screen being on the whole night would be about that sort of drain I'd say, you can get 9+ hours SoT if you don't use the phone and just leave it on doing nothing but as it was turned off I can only think bad battery or SoD
Hope you find the cause, or it was a one off and behaves from now on

*Detection* said:
Yea the huge % drop is definitely not normal, even left turned on with all radios enabled wouldn't do that, screen being on the whole night would be about that sort of drain I'd say, you can get 9+ hours SoT if you don't use the phone and just leave it on doing nothing but as it was turned off I can only think bad battery or SoD
Hope you find the cause, or it was a one off and behaves from now on
Click to expand...
Click to collapse
This isn't entirely on topic but why would the battery graph ever start at a point that isn't 100%? That happened to me today after turning it on in the morning, and the totals only add up to the amount used below 48%. Someone said it's from restarting or turning the phone on and off, but I thought that just showed a gap in the graph.
Sorry for the sort of irrelevant question, you seem to know what you're talking about and I see no point in starting another topic for the question.

Lalam24 said:
This isn't entirely on topic but why would the battery graph ever start at a point that isn't 100%? That happened to me today after turning it on in the morning, and the totals only add up to the amount used below 48%. Someone said it's from restarting or turning the phone on and off, but I thought that just showed a gap in the graph.
Sorry for the sort of irrelevant question, you seem to know what you're talking about and I see no point in starting another topic for the question.
Click to expand...
Click to collapse
The battery graph would only show 100% if the battery was 100% full when you powered it on, so basically the Y axis (vertical) shows battery full %, the X axis (horizontal) shows a time scale since last charge, which is why you get the gap when you have the phone off for a while
The app usage % is confusing, it doesn't always add up to the % that is missing from a fully charged battery, rather what % of the charge used since it started using the battery this session / charge, so if the phone has been off for a while with say a 50% charge, then powered on, you might see the app usage starting fresh with only a few % per app which won't add up to the missing 50%, and also if you partially charge the phone for arguments sake to 75% from 50%, then remove the charger, that can also reset the app usage % as it shows the usage since being on battery power only
That said, the above doesn't always ring true, I've just had my phone on charge for 30 mins, now at 76%, I rebooted the phone and removed the charger and the app usage stayed the same, not sure what circumstances are needed to reset the app usage % but I've seen it happen after partial / full charges, and also having the phone off for a period of time

*Detection* said:
The battery graph would only show 100% if the battery was 100% full when you powered it on, so basically the Y axis (vertical) shows battery full %, the X axis (horizontal) shows a time scale since last charge, which is why you get the gap when you have the phone off for a while
The app usage % is confusing, it doesn't always add up to the % that is missing from a fully charged battery, rather what % of the charge used since it started using the battery this session / charge, so if the phone has been off for a while with say a 50% charge, then powered on, you might see the app usage starting fresh with only a few % per app which won't add up to the missing 50%, and also if you partially charge the phone for arguments sake to 75% from 50%, then remove the charger, that can also reset the app usage % as it shows the usage since being on battery power only
That said, the above doesn't always ring true, I've just had my phone on charge for 30 mins, now at 76%, I rebooted the phone and removed the charger and the app usage stayed the same, not sure what circumstances are needed to reset the app usage % but I've seen it happen after partial / full charges, and also having the phone off for a period of time
Click to expand...
Click to collapse
I was about to say I didn't have this thing plugged in at all last night until I got to the end.
Either way the gaps in the graph suggest you can see it at 100% on the graph regardless of whether or not it has 100% when you turned it on. That's actually almost always what I see, or rather, up until last night I don't recall ever seeing the graph not start at 100%. Then again with the other battery issues I may just be noticing more now.
So to clarify, you've seen the graph start fresh, from a percentage other than 100, after not having charged it, correct?

Lalam24 said:
I was about to say I didn't have this thing plugged in at all last night until I got to the end.
Either way the gaps in the graph suggest you can see it at 100% on the graph regardless of whether or not it has 100% when you turned it on. That's actually almost always what I see, or rather, up until last night I don't recall ever seeing the graph not start at 100%. Then again with the other battery issues I may just be noticing more now.
So to clarify, you've seen the graph start fresh, from a percentage other than 100, after not having charged it, correct?
Click to expand...
Click to collapse
No not the graph, the app usage % under the graph resets after charging / powering off for a time
The battery level graph will remain at the level the battery is at no matter what I do with it
It doesn't start at 100% unless the battery is 100%, which is the way it should be as that right side axis is battery % level, wouldn't make sense to have it start at 100% if it was only 50% charged so not sure what's happening with yours

*Detection* said:
No not the graph, the app usage % under the graph resets after charging / powering off for a time
The battery level graph will remain at the level the battery is at no matter what I do with it
It doesn't start at 100% unless the battery is 100%, which is the way it should be as that right side axis is battery % level, wouldn't make sense to have it start at 100% if it was only 50% charged so not sure what's happening with yours
Click to expand...
Click to collapse
For me it's always once I charge it to 100% completely, that's the point the graph starts at and remains that way until I recharge it to 100% again. For example, another member of my family's s7 edge's graph, about a week ago, lasted for about 80 hours while only being charged to 100% once, those 80 hours ago. So it was put on the charger several times throughout but never reset the graph at those points. Then once it was charged to 100% again, it reset the graph. So I'm not saying it's suggesting I'm at 100% when I'm at 50%, but rather that it gives me usage history, on the graph, from the last 100% almost all of the time, and just shows gaps when I turn it off.
So that's why I was confused. What does your graph start at right now, out of curiosity?

Lalam24 said:
For me it's always once I charge it to 100% completely, that's the point the graph starts at and remains that way until I recharge it to 100% again. For example, another member of my family's s7 edge's graph, about a week ago, lasted for about 80 hours while only being charged to 100% once, those 80 hours ago. So it was put on the charger several times throughout but never reset the graph at those points. Then once it was charged to 100% again, it reset the graph. So I'm not saying it's suggesting I'm at 100% when I'm at 50%, but rather that it gives me usage history, on the graph, from the last 100% almost all of the time, and just shows gaps when I turn it off.
So that's why I was confused. What does your graph start at right now, out of curiosity?
Click to expand...
Click to collapse
Starts at 100% because that's when I took it off charge last night
Yea I think I know what you mean, if you don't fully charge it'll continue the graph from whatever charge level it is at once you remove the charger, happens here too if I don't charge for long, but lets say from 10% > 70% and remove the charger and it'll reset the app usage % but the graph level will remain at whatever % the battery is unless I power off for a length of time, then it'll act like a new fresh charge as seen here (No charging ramp before the 100% level 12 hours ago)
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*Detection* said:
Starts at 100% because that's when I took it off charge last night
Yea I think I know what you mean, if you don't fully charge it'll continue the graph from whatever charge level it is at once you remove the charger, happens here too if I don't charge for long, but lets say from 10% > 70% and remove the charger and it'll reset the app usage % but the graph level will remain at whatever % the battery is unless I power off for a length of time, then it'll act like a new fresh charge as seen here (No charging ramp before the 100% level 12 hours ago)
Click to expand...
Click to collapse
The graph seems to randomly reset on its own sometimes when you restart/turn off and on the device every now and then, no charger needed, which is what happened to me the other night, and what apparently occassionally happens to someone on androidcentral. I guess my real question is what's the point of the set up, and is there a consistency to it we're not seeing?

*Detection* said:
Starts at 100% because that's when I took it off charge last night
Click to expand...
Click to collapse
Anyway, thank you for all of the help and answering all of my probably useless question