Related
My original device always seems to take forever to go below 100%, and I just got a new device that has the opposite issue - it never goes above 94%. So I did some further tests, tonight.
My 94% device goes down fairly steadily once unplugged. But, the device at 100% does not. Also, when the 100% device is drained and I recharge it, it still says it's charging when its at 100% - so what does this mean?
I think that the battery calibration is off, as we already assumed. So, my 94% device is really 100% and I suspect that it would survive beyond 0% as it probably still has 6% juice left in reality. And, in the case of the 100% device, it's probably mis-calibrated to 105 or 110% (or more?). Since the UI can't show you 105%, it just shows the max of 100% until it goes below 100% which can take some time. I also suspect that the device would cut out at 5% or 10% since it's actually drained completely.
So that's the reason, I think. As to the fix, I don't know. What's weird is that these two devices are so different in terms of how the battery status is calibrated.
How can this be fixed? Or "Recalibrated?
I'm letting one of them completely drain, to see what happens.
At least the 94% one gives me an idea on what the battery life is, since I can just tack on +6%. But the one stuck at 100% is a complete mystery - it could be 5% off, 10% or even more.
Also, these run on 2 cell batteries making 7.4V nominal. All the devices before are using single cell batteries at 3.7V nominal. So Android may have issues with that voltage difference.
roebeet said:
I'm letting one of them completely drain, to see what happens.
At least the 94% one gives me an idea on what the battery life is, since I can just tack on +6%. But the one stuck at 100% is a complete mystery - it could be 5% off, 10% or even more.
Click to expand...
Click to collapse
I had the 100% battery issue before and it took a long time for it to dip below 100% (so long that it seemed unreal). Later I decided to let it drain to zero before recharging it to full again. Since then the battery indicator seemed to behave normally and discharged at a normal rate when the tablet was in use.
Have you tried deleting /data/system/batterystats.bin to wipe battery status? Mine sits on 100% for ages so I'm trying this now.
roebeet said:
My original device always seems to take forever to go below 100%, and I just got a new device that has the opposite issue - it never goes above 94%. So I did some further tests, tonight.
My 94% device goes down fairly steadily once unplugged. But, the device at 100% does not. Also, when the 100% device is drained and I recharge it, it still says it's charging when its at 100% - so what does this mean?
I think that the battery calibration is off, as we already assumed. So, my 94% device is really 100% and I suspect that it would survive beyond 0% as it probably still has 6% juice left in reality. And, in the case of the 100% device, it's probably mis-calibrated to 105 or 110% (or more?). Since the UI can't show you 105%, it just shows the max of 100% until it goes below 100% which can take some time. I also suspect that the device would cut out at 5% or 10% since it's actually drained completely.
So that's the reason, I think. As to the fix, I don't know. What's weird is that these two devices are so different in terms of how the battery status is calibrated.
Click to expand...
Click to collapse
samepic said:
I had the 100% battery issue before and it took a long time for it to dip below 100% (so long that it seemed unreal). Later I decided to let it drain to zero before recharging it to full again. Since then the battery indicator seemed to behave normally and discharged at a normal rate when the tablet was in use.
Click to expand...
Click to collapse
I tried that once, by setting it to never shutoff and letting it go over night. The next morning I charged it to green plus 30m as someone suggested in the TnTL thread, but I still had the problem of the meter sticking at 100% for a long time.
Anyways, I installed 3.0.0(TnTL) on monday and decided to also use the CWM clear battery data option, and now it seems to be dropping more as expected, but I'm not entirely sure that I did it completely correctly as by the time that I did the clear battery data option it would've been below 100% charge since I did so AFTER running the update.zip... just have to wait and see now...
Battery Stays at 100% For Ages
My battery stayed at 100% for ages the first time I charged it. Then it dropped quickly and cut out around 50%. I recharged it and it seems to be behaving more normally now. It still seemed to hang at 100% for a while, but no where near as long as the first time. I'm waiting to see at what percentage it dies this time.
my zt 180 tablet never got above 94% also. And it dropped pretty quickly and at around 40% it seemed to get a second life and slow down, but eventually it went all the way down to about 10% and then I would charge it (about 3 hours max). It too is a 7.4v supply.
My Odroid T had a 3.4 supply and it was pretty linear, showed charged at 100% and went down accordingly, though the developers had some issues with a few software releases where it did behave erraticaly and they did a few patches that fixed it.
roebeet said:
My original device always seems to take forever to go below 100%, and I just got a new device that has the opposite issue - it never goes above 94%. So I did some further tests, tonight.
My 94% device goes down fairly steadily once unplugged. But, the device at 100% does not. Also, when the 100% device is drained and I recharge it, it still says it's charging when its at 100% - so what does this mean?
I think that the battery calibration is off, as we already assumed. So, my 94% device is really 100% and I suspect that it would survive beyond 0% as it probably still has 6% juice left in reality. And, in the case of the 100% device, it's probably mis-calibrated to 105 or 110% (or more?). Since the UI can't show you 105%, it just shows the max of 100% until it goes below 100% which can take some time. I also suspect that the device would cut out at 5% or 10% since it's actually drained completely.
So that's the reason, I think. As to the fix, I don't know. What's weird is that these two devices are so different in terms of how the battery status is calibrated.
Click to expand...
Click to collapse
Warning: Slightly off topic -
I'm glad Roebeet was able to get a 2nd Gtab. Hope you found a good discount. Happy Holidays!!!
Now back to the topic discussion...
Butch1326 said:
Warning: Slightly off topic -
I'm glad Roebeet was able to get a 2nd Gtab. Hope you found a good discount. Happy Holidays!!!
Now back to the topic discussion...
Click to expand...
Click to collapse
Off-Topic x2 : yep, got used one that another XDA user had returned!
On-Topic: Still waiting for the battery to discharge, it went to sleep last night. Getting close....
roebeet said:
Off-Topic x2 : yep, got used one that another XDA user had returned!
On-Topic: Still waiting for the battery to discharge, it went to sleep last night. Getting close....
Click to expand...
Click to collapse
I also had the issue of battery showing 100% for a long time and then cutting out around at 50%. One of the posts mentioned doing a battery stat wipe in CWM after charging to 100% + 30 minutes.
I did this with a little twist of my own.
I allowed the battery to drain completely and tab to shut off. Plugged in the charger and immediately did a battery wipe in CWM. Allowed the battery to charge fully upto 100% + let it be on charger for additional time till the battery symbol in the notification bar no more showed charging sign. Again did the battery stat wipe in CWM and then rebooted the tab.
Since then i observe that the battery has been draining as it should be expected to. down to 72% after about 4+ hours of use. I will still be monitoring the battery discharge further for two or three more charge cycles. But I feel doing battery stat wipe in cwm 2 times at full drain and then again at full charge might have helped caliberate it properly.
Let me know if anyone else tries this and gets same or different observations.
Try installing this to measure your current usage over the life of the battery... (dont have a GTab and still considering). Since most likely this widget and the battery monitor are using the same API we will see if its a hardware sensor issue or a software issue...
http://www.appbrain.com/app/currentwidget/com.manor.currentwidget
I suspect its in their battery monitor and not the sensor or API... if that is the case it should be easy to debug (if you have the source). Typically these issues are due to poor polling algorithms...
Im new to android so I am unfamiliar with profiling capabilities of the platform...(Still learning)
Perhaps this will be one of the 'little fixes' that will be present in the latest FW update when VS drops it tomorrow. I have the 100% unit BTW. A fix would be nice.
Reading this thread this morning it got me thinking about my gtab battery situation. When I first got the gtab, the battery stayed at 100% for hours, then the percentage dropped like a rock. Over time, the battery dropped in more regularly, although it drops in large numbers (like from 100% to 83%, then to 67%, and so on). I'm currently running TnT Lite 3.0.
This morning I charged the battery to 100%, and while plugged in (to the AC outlet), I reset the battery stats using cwm. The battery today has been steadily going down throughout the day as I would expect. In over 8 hours, I watched the battery go down steadily from 100% to 84%. So far, so good.
my exp
Tried draining once, just let it sit, didn't fix it.
Tried again but this time I kept the screen on and watched the voltage, shutdown was near 6.8 volts. Now the meter is accurate. YMMV...
@it'sDon - it wasn't fixed in the update.
I was in the same boat as most of you. Took a very long time to go down from 100% and then zonked out completely at ~10-15%. It's now been charging for a few hours and it's been sitting at 100% for quite a while but the light is still red (so it's still charging) which means it will probably happen again looks like it's charging to some value over 100% and when it discharges, knocks out while the meter is still reading as having juice. Roebeet is 100% on the money.
I am going to try the CWM battery value reset some of you mentioned to see if it does something once my light is green, then I won't charge it and watch it like a hawk once it hits 20% to see if it shuts down at 10-15% or a value less than 3% which is acceptable I think.
I never had a problem on my stock(ish) g-tablet. That is until I installed the latest update.
I had to do a data wipe before any of the cosmetic TnT changes would show. After that the battery now seems stuck at 100%. This wasn't that way before, so I will try draining the battery, and see what happens.
Since I found that this was tied to my latest update, I think that I should call CS and complain.
My battery drain didn't make a difference, either. Still haven't pinned down a fix that works.
At least those of you with 94% max have a general idea when your battery will die. With us "100% forever" ones, we have no clue.
Actually, I may not have a problem after all. I have had my tablet on for about two hours. It is now showing the battery at 86%.
Well Im not saying the battery life itself is bad, but well for example, I just drained the battery completely (phone shut down by itself) and within about 2 minutes of putting the charger back in the indicator read 70%.
Im currently using the method where i run it down to 1% then fully charge, rinse and repeat. (Just started doing this)
Just thought I would share
sambaman009 said:
Well Im not saying the battery life itself is bad, but well for example, I just drained the battery completely (phone shut down by itself) and within about 2 minutes of putting the charger back in the indicator read 70%.
Im currently using the method where i run it down to 1% then fully charge, rinse and repeat. (Just started doing this)
Just thought I would share
Click to expand...
Click to collapse
no problems here, but apparently half the people in the battery threads have issues with battery life.
hmmm, well I just want to get this right because it gets annoying when it says 100% battery then goes down in about 20 minutes
I've had issues with battery life indication on my Omnia 7.
I can have it showing 70%, then it would suddenly drop to showing around 10%. Then by turning off and on several times it will sort itself out and show the correct amount.
This has only happened once or twice mind...
No problem here on my HTC 7 pro. Though I did calibrate one battery and not the spare, both perform the same.
I have no problems either on my omnia 7
follow this::
http://forum.xda-developers.com/showthread.php?p=15338429#
No issues on my Focus. Maybe this is a device specific issue?
sambaman009 said:
Well Im not saying the battery life itself is bad, but well for example, I just drained the battery completely (phone shut down by itself) and within about 2 minutes of putting the charger back in the indicator read 70%.
Im currently using the method where i run it down to 1% then fully charge, rinse and repeat. (Just started doing this)
Just thought I would share
Click to expand...
Click to collapse
No problem with my trophy but a good practice to keep you battery in shape is to start charge at 15-20% (dont leave it until is dead is bad for the battery) and dont charge it to 100% ...stop charging at 90-95% ...
That is what i do with all my mobile devices and rarely i have probs with my batterys.
Hi guys
I should be picking up my SGS2 today and I was just wondering what exactly I should be doing with the battery? I've read in a bunch of places that draining the battery fully and then recharging it fully gives better battery life, but I've also read this:
Lithium ion batteries do not respond well to full discharge, you will see reduced capacity and early failure if it happens too often. In any case it is not possible to overcharge the battery on a BlackBerry because the battery and phone have enough intelligence to control the charge (unless the battery is already defective).
Click to expand...
Click to collapse
(this is from crackberry.com but you get the idea)
What's the best thing to do?
And on Android phones, when the battery indicator shows 20% or something, is that when the phone is going to die? Or will it die at 0%? Obviously at 20% it would be to protect the battery but maybe Android has been programmed to show 0% when the battery is actually at 20%.
Thanks,
Elliott
read manuals !!!!!! You can see this
Did not receive an owners manual with my phone. Anyway...phone is charging now so too late I guess...
Starholdest said:
Did not receive an owners manual with my phone. Anyway...phone is charging now so too late I guess...
Click to expand...
Click to collapse
The manual is probably stored on the phone, at least my new Ascend II came with its stored on the phone, you have to goto the big menu (forgive me for not knowing the technical term for it) to find it however
i got my battery fully charged...then in the first day i discharged it till 10% at least that's what my phone was saying
i read too that the new li-ion batteryes do not need to be "formated" (fully discharged till the phone dies and then fully charged with the phone turned off) in android case i think that thing is not posible coz it needs at least 5% to pass the bootloader and then begin to charge
anyway in my manual it says that the battery will begin the normal state after 8 days of use, until then it may disschage quick
i have a motorola defy
Calibrate the battery. Charge the phone while its switched off for about 6 hours, and then use the phone untill the entire battery runs out and it switches off on its own. After this, the phone should be able to use the battery properly.
i just used my galaxy and made it empty, then charged it full.
nowadays i have runtimes from 3days (72 hours) and then its @ about 5%
there seems to be a lot of back-and-forth regarding whether or not draining a battery is healthy; i drain my iphone battery down to zero about once a month and the battery has been doing fine for two years . . . whether it would be doing just as well without the draining time is anyone's guess.
I have always been under the impression that lit-ion batteries do not need any kind of special care or break in. But since our phones estimate the charge, we should occasionally let the battery run out to reset the calibration in case it gets screwed up.
Sent from my DROIDX using Tapatalk
I don't think you need to worry about draining the battery till it's dead. My phone dies often and the battery is still kickin It's my understanding, that the purpose of draining the phone before you charge it is to calibrate what the OS says for charge remaining to the battery's actual charge.
Or something like that...
Hi all,
I have my sgs 2 since June and it's working pretty well apart from the battery drain which is very harmful in my daily life
I've recently flashed the Cognition 1.30 (last friday). Before that, my sgs was able to last the entire day before discharging with a moderate use (10-20 mn on games, few sms, 15 mn consulting mails, 1 hr on internet). Since i've flashed with the cognition Rom, the battery drain is really awesome!!!!!!
I fully charge the phone (switched off) then when i switch it on and the phone stays idle, after 1 hr or so, i've already lost almost 20%. When i'm on internet or playing games, the battery loss is approximatively of 1% per min.
I've made a full wipe and recalibrated my battery so normally it should at least last a day and thats not the case.
Could somebody help me or should i buy a new battery and test it ?
Because i relly like this rom and from others users, it has a good feedback concerning the battery use
I posted this in another forum and the response I got was somewhat weak. Instead of re typing everything I will cut and paste my posts and hopefully you guys can guide me in the right direction!
Here was post 1 -->
I just bought a Rooted Nexus S from ebay. It is running this ROM Nexus S ICS 4.0.4 stock OTA ROM (IMM76D)
Now, I know nothing about android, I'm coming off a series of old turd phones because i'm always breaking them. I'll probably break this one too, but hopefully not for a while.
When I got the phone I put the battery in and turned it on, then charged it overnight. It will only charge to 54% and stay there. I talked to the seller he said it charged normally for him. He said he did a complete wipe and USB wipe before he shipped it.
The battery seems to drain normally (I guess, I have nothing to really compare it to) from 54% but it would be nice to have it charge to the 90% -ish range haha. I allowed the battery to drain to 40% and put it back on charge, it been on charge for almost an hour and will only charge to 41%? Do you guys have any ideas what I can do to fix this? Is this a sign it needs a new battery, or a software glitch? The seller said the battery shouldn't need replacing.
Also in the battery app under setting, Android System is using 28% is that a lot?
My last question is an important one to me haha. Is there anyway to convert the querty keyboard to a T9? I 've gotten used to texting with one hand and T9 makes it so much easier to do so.
Thanks everybody!
Someone recommended I try the battery calibration app So I did!
Post 2
Ok, I ran the Battery Calibration app. I let my phone charge for hours. It would only charge up to 38% this time. However, the percentage was 38% but it was charged to 3810 mV (and would not charge past this point). And full charge is approximately 4200 mV according to the Battery Calibration app. So I assumed that 3810 mV was my current battery's max charge (keep in mind it is a couple months old) and set battery calibration at that point.
This is from the app description --> It's suggested, but not necessary, to let the phone fully discharge after calibration, then charged to 100% without break.
So thats what I'll do. I should mention that even though I ran the battery calibration, the battery percentage has been draining from 38%. In other words, my phone now reads 26% battery charge, but is at 3758 mV.
I'm thinking that when I go to charge it after fully draining the battery, it will hopefully charge close to 100%. It seems as though the percentage is the only thing that is off. Because the mV reading seems accurate.
Here is a screenshot, what do you guys think?
This site won't let me post the screen shot until 8 posts, but I will do that once I get there!
Post # 3
The app says to let the phone fully discharge after calibration. I am now at 15%, but mV is at 3658. Should I recharge when the percentage has dropped lower, or when the mV reaches a low point? Are these phones really this finicky. I'm starting to miss my old 2007 flip phone haha
It's now at 14% and now asking for me to plug it in to charge lol but mV is still way high (3655)
Post #4
update, charge % reached 0 and the phone shut down. Now charging, Current charge is at 0%, 3595 mV. No one has any idea whats up?
Shouldn't mV be near 0 when charge is at 0%, and be near 4000mV when charge is near 100%?
hopefully you guys can help me fix this issue. Otherwise it'll have to go back to 'ol reliable, the 2007, multiple cracked screen, nokia slider lol It's not pretty, but it works!
There is a built in safety feature in our batteries to prevent deep discharges. IIRC, the safe cutoff point is around maybe 34xx mV. I could be off, but its to prevent damage to the battery. Here's more on them
http://batteryuniversity.com/learn/article/is_lithium_ion_the_ideal_battery
As for voltages, a full battery should be around 4100mV. Mine tops out around 4196. I'm not too familiar with all of it though. Most of the stuff I learn is through observation and links others provide.
Thanks for the reply! So are you saying that when the voltage is around 34xx the battery charge % should be close to or around 0%. And when the voltage is near the 4000mV range the charge %tage should be approximately 9x%
Do I have the right idea here?
Its hard to say while its charging. My phone is at 4000mv around 70% so I don't really know exactly how it works. But a full battery should read around the voltages I posted. There's people on here who know more about it, so hopefully they'll chime in.
But yes. When its close to zero, it should be around that range. It will differ from battery to battery.
Ah k thanks! My original problem was that the phone would only charge to 54% and would not go past that point. I'm waiting to see if it will get into the 90 ish % range after running the battery calibration now.
The app itself doesn't actually do anything. The stats will get reset once the charge reaches 90% My girlfriend's phone was the same way. It wouldn't charge past 75%. I let the phone run dead and charged it while it was off and it fixed the problem. If it doesn't go to 90%, try charging while off and just letting it run until it gives the warning to charge, turn it off and let it charge overnight .
Ok. Well I let the phone run dead earlier today as I mentioned in one of the above posts. But I didn't charge it with the phone off. I put it on charge with the phone on, and now it won't charge past 11%
It just seems to be getting worse and worse? It's been going between 10% and 11% and has been at 11% for about 2 hours now. Maybe this time I will drain it again and try charging it with the phone off like you suggested.
This is slightly annoying
All else fails grab another battery. They're dirt cheap on eBay. Just get one from a reputable seller
Ok, so I let the battery drain. then fully charged it with the phone off. When I turned it on, it had 47% charge.
The guy I bought it from said that before I buy a battery I should download an app called rom manager and download a new rom. he thinks its a software bug because he had no problems with the battery when he was running cyanogen mod 9 on it.
I wouldn't mind giving trying this, except I don't even know what a rom is. Is it operating system? I like the way the phone works now, If only I could get it to charge fully.
Thoughts?
Ok, I just did a bunch of reading and downloaded ROM manager premium. Hopefully I get this figured out. Owning one of these phones is a lot of work
lts pretty much a pocket computer. Coming from an older type of phone, a lot of things are going to be different. Gotta start somewhere. Reading up on it and toying around with the phone will help in the long run. Trust me.
or not....
louderstill said:
or not....
Click to expand...
Click to collapse
Haha, pretty much. I'm slowly starting to learn more. I didn't think there was this much of a learning curve, thats what took me by surprise thats all. I'm a fast learner so I'm not too worried. I didn't have time to play around on it tonight, maybe on the weekend. I found out I could use it without the sim card which is awesome! Because now I can use old faithful while I learn more about android.
Thanks for the help so far though, I'm sure I'll have more questions soon haha
Haha. Yep. You can have tons of fun just using it over wifi!
Do keep in mind, fully dishcharging a lithium ion (li-ion) battery deteriorates the battery even more. We only discharge because older phones use nickel cadmium batteries which need more maintenance to get to their maximum life span and use.
Off topic though.
Battery calibration just wipes your battery stats. You can do this by going into any recovery program eg clockworkmod receovery or team win recovery project. You can wipe the battery stats yourself. If that still doesnt work. Try doing a clean install of your custom rom or kernel. If your not on a custom rom or kernel. Nor your rooted. Try formating the SD card in the Nexus S (or fully wiping the sd card). Than do a factory reset.
Ok, so I finally had some time to learn to flash etc. After backing up, I downloaded and flashed the same rom from SD, I cleared davlik cache and also selected the wipe data and cache option from ROM Manager (I assume that this is what is called a clean install?)
This is the ROM I am using http://forum.xda-developers.com/showthread.php?t=1653713 Slightly customized stock ROM, rooted.
After start up I waited a while and then plugged it into the charger, it only charges to 54% still. Sometimes it creeps up. One thing I noticed is that if I use the phone while it is charging, it actually drains the battery. So it will go from 54% to 52% and slowly drain. Is this an indication of a pooched battery?
Any suggestions? I will order a battery. Where do you guys order your batterries, I read that the oem samsung 1500 is reliable.
Not sure what's happening with my phone, but after removing the plug on my fully charged phone, I will let my phone sit idle for about 10 mins, when I go wake the screen, I see that I've already lost 3% of battery capacity.
The weird part is after this initial 3% is gone, my battery will drain normally. Does this mean I need to calibrate my battery? Is there anyway to do this without damaging it?
It means you need to get a new hobby... seriously, why do you care if it changes nothing what so ever. In order to fix this, you should try not checking your battery percentage every 2 minutes. On the upside, this will probably give you another half hour of battery life as well.(damn a change of attitude would fix like 90% of problems on this site)
On a more serious note, it's likely just because your phone doesn't keep charging when it hits full charge, it stops charging in order to not kill your battery, and lets it drain to like 90% at which point it will charge back up to 100%, so it may be at any point in between when you disconnect it. Even if it is truly at 100% when you disconnect the charger, the measurements may not be completely accurate when approaching 100%, so it is likely, that could make it drop faster at first. You need to do nothing in order to fix this, seriously don't mess with it.
CoronaDelux said:
Not sure what's happening with my phone, but after removing the plug on my fully charged phone, I will let my phone sit idle for about 10 mins, when I go wake the screen, I see that I've already lost 3% of battery capacity.
The weird part is after this initial 3% is gone, my battery will drain normally. Does this mean I need to calibrate my battery? Is there anyway to do this without damaging it?
Click to expand...
Click to collapse
Are you running stock or custom kernel and any custom ROM? Ive noticed this sometimes too but that's because the phone, when unplugged is running services to start phone on battery power versus the cord/wall charger. Check logcats to see what happens when phone unplugged to see what may be happening when phone starts on battery.
I think you are worrying about it a little too much. It could be searching for service (which drains a lot of battery), starting services as someone previously said, heat is horrible for a battery, anything. If the drain is normal after that who knows it could be the ROM you are on, battery percentage not being reported correctly.
Not worth an RMA by any means. Reset battery stats in recovery and see how that works out for you.
Bear in mind, these batteries are cell batteries, a user who plugs their phone in every time the battery hits 50%, is going to notice over a period of time the time it takes to go from 100% to 50% is shorter and shorter, and suddenly, 49%-0 holds a better charge. If you're constantly charging your phone, you'll wear those cells of your battery down. This is where the "hoax" of always letting your battery drain to 0% when you get it to "maximize" battery potential came from.