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Random severe battery drain

I have the 2750 mah battery in my phone. Bamf 1.5 with the new radio. 4 hours off the charger and it is at 65 percent. Any idea? All syncing is off, screen at 40%, no Widgets other than fancy widget on. This is nuts. I can't figure out what's going on.
Sent from my ADR6400L using XDA Premium App

Have you wiped battery stats?

I have the same issue. One day my phone goes 20+ hrs on a charge, the next day it drains 40% in 3 hrs, with no significant change in usage. I've swapped kernels, wiped battery stats, kill nonessential apps & services, and I still can't find the culprit. But my extra battery is in en route, so I'm not too concerned

No. Haven't wiped battery stats yet. I heard bad things about wiping the stats on the TB.
Sent from my ADR6400L using XDA Premium App

I get the same thing every few days and it drives me crazy. You can instal a current widget and it'll show you what the draw is. Normall idle I'm at 38mA. But in these bouts of mystery drain it'll go up to 250-300mA for no reason. And this is with wifi/4G off too. But once I turn it on airplane mode the current goes back to normal until I take it off airplanel. So it's something to do with the regular cell radio...

Its ridiculous. Its stuff like this that kind of make me wish HTC held this back another few weeks.
Sent from my ADR6400L using XDA Premium App

yeah i have this issue also. today Google Voice had partial waked my phone to 50% battery. i don't get it.

I have seen the same thing, anyone also notice the battery cooking when the drain is going on. I usually reboot the phone thinking an app is hung just banging on the system, sometimes it works other times not so much.

+1 i'm seeing this as well. when its happening the phone gets really hot. i hope this gets figured out.

chrisjm00 said:
I have the 2750 mah battery in my phone. Bamf 1.5 with the new radio. 4 hours off the charger and it is at 65 percent. Any idea? All syncing is off, screen at 40%, no Widgets other than fancy widget on. This is nuts. I can't figure out what's going on.
Sent from my ADR6400L using XDA Premium App
Click to expand...
Click to collapse
I had this problem on the BAMF 1.5 ROM + kernel combination. I recently switched to Imoseyon lean kernel (http://forum.xda-developers.com/showthread.php?t=1021404) and now the battery life is amazing. I've been off the charger since about 12:33am (CST) and it is now 12:28pm (CST) and I'm at 52% with average use.
On battery calibration. I strongly recommend doing this if when you restart your phone you lose drastic percentages. I was losing 11% with a restart indicating that it wasn't reporting accurate battery status. I used the battery calibration tool which is on the market. Now here is the kicker that i learned from Droid Incredible days, you have to fully charge the battery. That does not mean wait till your phone reports 100% that means turn off the device and charge until the notification led turns green and start up the phone and let it charge to the light goes green again then calibrate. Then disconnect and use til completely dead without plugging it in AT ALL!! This has worked for me.
Hope this helps everyone.

i really hope this thread doesnt die since this is a real problem apparently quite a few people have....

I didn't read all the post but after flashing a radio you have to wait a couple days yoga week before the battery can recalibrate.
Sent from my ADR6400L using XDA App

Battery monitor is showing 1350mAh
Wondering if I have a bad battery or maybe that's how it's read? Shouldn't it read 1400 instead of 1350?

I have this problem too... Its because something is not letting the kernal throttle down. Check setcpu and you will see it stuck on the Max speed. The smartass gov is most suspect because it doesn't use profiles

It's just the way it is for now. For the last 2 days I've been getting horrible battery life. All of a sudden things changed today. Battery drain is between 30 & 38 every 60 seconds. 2 days straight of 250-300 drove me frigging crazy.
Thunderbolt - BAMF Remix 1.5

Yeah I have these random cases too. However a reboot fixes the issue. Besides faster than normal battery drain, you should notice higher battery temperature.
I believe it's an application issue, something that we can't tell yet.
Honestly I have high hopes for the TBolt down the road. When Evo first came out, we were experiencing similar problems too. Given time the devs were able to get them solved. This is why I prefer HTC and XDA.

I got great life today. Yesterday was terrible. I'm still getting the large drop in percentages on reboot, but battery life is draining slowly. Something I was wondering is if we lose 15 percent on a drop, does that mean the battery is actually 15 percent lower when I restart? So if my battery is at 60 percent in my task bar, is it actually 45 percent? And if that is the case, what happens when it drops down to 10 percent on my taskbar? In theory that would mean the battery had 0% life. Now the strange part of that is I'm still losing battery from 10% down to 0%, once it hits 0 it shuts off, however, if I restart the phone at 8 percent it won't reboot. So why will the phone stay running at 8% battery, but it will not boot back up after the restart. Its been a long day so sorry if I'm rambling or not making sense. But you know what I'm getting at.
Sent from my ADR6400L using XDA Premium App

D3TH METAL said:
Wondering if I have a bad battery or maybe that's how it's read? Shouldn't it read 1400 instead of 1350?
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Click to collapse
Just the way it is, the thunderbolt technically has a 1350 mAh stock battery.

I saw a thread on another site that says, if you recalibrate your battery once a month it will help... Full charge... Unplug.. reboot...3 times only has helped mine.... Now I Only loose 2-3% of battery per hr...
Sent from my ADR6400L using XDA App

RogerPodacter said:
Just the way it is, the thunderbolt technically has a 1350 mAh stock battery.
Click to expand...
Click to collapse
oh ok. Thanks

[Q] Battery Calibration

I read a lot of thread about battery calibration so I want to know if someone try this on XT720 and if it's really usefull and not dangerous for the phone.
Thank you

It is useful and not dangerous at all. Your battery has, if stock that came with phone, a full charge of 4.2v.
So let's say that you have been conservatively using you phone most of the day and are at 70%. You decide to flash the Hellmonger edition or CM6 but you make a nandroid backup first. You flash them and it goes horribly wrong and your phone power dwindles down to 30% and you freakout and charge it back up.
When it is charging, you decide to hold off on flashing for a bit and want to go back to your "home" ROM, whatever that may be. You let your phone charge up to 100% and re-flash your back up. Once it reboots and settles down, you happen to notice that just 5 mins ago you were at 100%, but now after flashing your backup, your battery shows 70%.
30% drop in 5 mins is rediculous. Yes it is, bit it didn't really drop 30% in 5 mins because when you backed up your original ROM, you also backed up your data/system/batterystats.bin that was calibrated to 70%.
If you use Battery Calibrator and charge it up fully, run app, hit it and then unplug, it deletes the data/system/batterystats.bin and in a few seconds (5 ithink) it creates a new one with you proper charge and voltz.
So if you flash a lot, this is good for you. Or you can delete the batterystats.bin manually if you want, but there's an app for that.

Woodrube said:
It is useful and not dangerous at all. Your battery has, if stock that came with phone, a full charge of 4.2v.
So let's say that you have been conservatively using you phone most of the day and are at 70%. You decide to flash the Hellmonger edition or CM6 but you make a nandroid backup first. You flash them and it goes horribly wrong and your phone power dwindles down to 30% and you freakout and charge it back up.
When it is charging, you decide to hold off on flashing for a bit and want to go back to your "home" ROM, whatever that may be. You let your phone charge up to 100% and re-flash your back up. Once it reboots and settles down, you happen to notice that just 5 mins ago you were at 100%, but now after flashing your backup, your battery shows 70%.
30% drop in 5 mins is rediculous. Yes it is, bit it didn't really drop 30% in 5 mins because when you backed up your original ROM, you also backed up your data/system/batterystats.bin that was calibrated to 70%.
If you use Battery Calibrator and charge it up fully, run app, hit it and then unplug, it deletes the data/system/batterystats.bin and in a few seconds (5 ithink) it creates a new one with you proper charge and voltz.
So if you flash a lot, this is good for you. Or you can delete the batterystats.bin manually if you want, but there's an app for that.
Click to expand...
Click to collapse
So, if I understand, it's not so usefull because after I lose my 30%, if I charge and I have 100% it's really 100% not 70% right ?

I would say that it is always best to start from a clean slate. It deletes that batstat file and starts anew. Can't hurt, but if you are flashing ROMs every 3rd day like most of us, it does come in handy.
For the moral of the stroy, it will not damage your phone. Just a one click app that you can do manually with Root Explorer if you wanted to.

Woodrube said:
I would say that it is always best to start from a clean slate. It deletes that batstat file and starts anew. Can't hurt, but if you are flashing ROMs every 3rd day like most of us, it does come in handy.
For the moral of the stroy, it will not damage your phone. Just a one click app that you can do manually with Root Explorer if you wanted to.
Click to expand...
Click to collapse
Ok, thank you, I will use it when I will flash a new ROM.

Do you actually have to drain the battery fully after calibration?
Sent from my MilestoneXT720 using XDA App

eejin2 said:
Do you actually have to drain the battery fully after calibration?
Sent from my MilestoneXT720 using XDA App
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Click to collapse
Its recommended that the battery drain fully, and then be recharged without interruption. I guess thats to give android a full scale from full to empty, to help better report battery stats and consumption.
However for me full drain means 10-15%, its hurts the battery to be drained till the phone powers off.

sohrab.naushad said:
Its recommended that the battery drain fully, and then be recharged without interruption. I guess thats to give android a full scale from full to empty, to help better report battery stats and consumption.
However for me full drain means 10-15%, its hurts the battery to be drained till the phone powers off.
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Click to collapse
Haha battery calibration definatly helps the battery a lot but u suggest not draining battery fully??

androidlover123 said:
Haha battery calibration definatly helps the battery a lot but u suggest not draining battery fully??
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Click to collapse
I used to drain it fully till my phone turned off before calibration but I read a very detailed article about how draining the battery completely can hurt it. So I choose to drain it till 5-10% which is good enough

How come sometimes when the battery is full it shows 4200mah like it should but sometimes it shows less like around 4165mah in the battery calibration app? At 4165, I still left it there to charge to see if it would increase or not but it didn't...
Sent from my MilestoneXT720 using XDA App

I know that the last little bit of charge just trickles in and takes a long time. If mine is at somewhere between 4150 and 4200, i call it good and go from there. If it was showing at say 4095 and 100%, then there might be something wrong with either the data or the battery. If you are sitting at 4165, then it is charged for the most part.
The app and what it does is more for when you are flashing a ROM and have around 60% and then once booted up fully, you charge it up to 100%. Decided you don't like your ROM and go back to your original ROM via backup, it will show 60% instead of the 100 or 90% you had before you went back to back up b/c you backed up the batstat bin when you nandroided your original ROM.
How about this:
ROM: Epicsteelblue 70% (and you made a backup) Then went to CM6, charged and hit calibrate battery at 100%. Used CM6 for a few hours and decided it wasn't your bag. Your batter is at 50%. You flash back to your Epicbluesteel ROM and you know for a fact you had 50% before you flashed back, but now once totally booted, you are showing 70%. This is why you use the battery calibrator after you flash a ROM. Gotta create a new batstat bin for you "fresh" ROM (even though it is a backup).
Hope this helps explain better.

eejin2 said:
How come sometimes when the battery is full it shows 4200mah like it should but sometimes it shows less like around 4165mah in the battery calibration app? At 4165, I still left it there to charge to see if it would increase or not but it didn't...
Sent from my MilestoneXT720 using XDA App
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Click to collapse
That happens sometimes to me aswell. The battery calibration app shows the battery full at 4165 or somewhere in that range. What I do with that is bump charge it. So if battery calibration shows 4165, i just calibrate it and turn the phone off while it is connected to the charger. When it turns off the charging screen appears and shows 100%, i leave it there for an hour or two. Then remove and turn the phone on. If you go into the battery information itll show the charge to be 4200 or close to that. Hope that was helpful you can try it next time.
EDIT: The reason I turn the phone off and let is charge is that when it reboots after fully charging to 4200 it can create a fresh battery stats. Remember battery stats are only rebuilt upon boot. If you calibrate your battery and then dont reboot its useless. To test calibrate it, and then use it for awhile and then try to recalibrate it the app will indicate that there are no battery stats avaible to delete. This is because the ROM has not made any new battery stats and will only make them on boot.

hey guys has anyone tried this method (http://forum.xda-developers.com/showpost.php?p=11803458&postcount=10) of calibrating battery? it seems the dev says that if u use his method, you can calibrate without downtime!!

wow this is damn cool. but its kinda complicated. the old way feels better for me i think...

Battery Updates
The battery updates every 10%, is there any way to make it update more precisely, like every 5%?

I've never been able to get anything better that 10% battery increments

Okay thanks maybe in a future rom this would be nice.

Hi
Is their a way to change from 10% to 1% increameants.
Sent from my XT720 using xda premium

eejin2 said:
How come sometimes when the battery is full it shows 4200mah like it should but sometimes it shows less like around 4165mah in the battery calibration app? At 4165, I still left it there to charge to see if it would increase or not but it didn't...
Sent from my MilestoneXT720 using XDA App
Click to expand...
Click to collapse
It is the property of all rechargetable battery, 4.2V can only see at the moment charging progress just finished. when the power management IC pull of charge current, battery's voltage will drop a litte in a very short time, like you said, 4.165V for example. And, because of your charger is connected, battery will not drain, It won't be another charging progress witch you are expecting.

I know I'm digging up an old thread here, so sorry for that. I've recently tried a few other ROMs, but since have come back to CM6.3.7. I always do the battery calibration thing when I flash ROMs and each time I've tried it lately, it gives me odd information in the Battery Usage screen. I charged my phone to 100% yesterday before leaving work and when I got to work today, it showed 70%, which seemed normal, but the Battery Usage screen showed "1h 24m since last unplugged" and I know I hadn't plugged it into the wall or USB for about 12 hours. I did restart once....could that be the reason why the time since last unplugged is incorrect?

Going nuts!! Battery...

Have to charge almost twice a day... I believe it happened after latest 1.45.531.1 update....
Disabled all animation, got auto adjust for display, disabled all what I could.. Still gives me 12 -16 hours on standby only....NOT even using the phone!!!!
Does anyone have something like that??? Or there is some remedy I skipped?
Sorry if I repeat someone's question.
Running full stock, HTC battery.
Thanks in advance!!
Tester.
PS. Recently exchanged the phone.... First one R.I.P......died completely, didn't even charge.
Is there a chance they swapped a refurbished one on me??? How to find out???

can you provide a screenshot of the battery usage graph? also, have you tried getting an aftermarket, bigger battery such as the anker?

I was the same way as you. I checked my battery graph, and standby was using something like 80% of the battery with almost everything turned off. By the time I got home from work I would need to charge it immediately. I bought one of the Anker batteries on Amazon for $15 bucks or so, and I'm now getting about 2 days for a charge. I don't know what it was with my battery, because it sounds like my experience wasn't typical, but I didn't really feel like going through HTC when I could just pay the $15.

I'm with ya...
This phone was running PERFECT prior to the HTC update. Now I'm having a plethora amount of problems, including the battery. For example, prior to the update I would get 13-16 hours on HEAVY usage... Moderate usage? Try a day or day in a half. Now take today for example, I unplugged my phone a little before 7am and I had 20 something percent 4 hours later.
I'm telling you, that HTC update really messed this phone up IMO.

Thanks, guys!!
Will try to get Anker battery, I believe it's 1900 mAh.
But again something running on the background with that update. We'll see.
I'll try to get the graph, maybe someone'll get some sense of it...
Much appreciated,
Tester.

here are the battery stats...
Display..........74%
Cell standby...13%
Phone idle......11%
Voice calls......2%
THAT'S IT!!! Nothing else is running...... SUX...
Still gives 12 - 16 hours of life on almost idle......

I hate to say it,but if you're battery's dying a lot faster after an update,a bigger battery won't help much.
I'd be getting in touch with HTC and ask them what the heck is going on.

Really annoyed with the battery performance. I checked and only display is using 90% of battery. Tried everything to reduce it but no change.
Sent from my HTC Sensation Z710e.

Tester30 said:
Have to charge almost twice a day... I believe it happened after latest 1.45.531.1 update....
Click to expand...
Click to collapse
I've had the same issue since the update. My battery drains at a ridiculous rate. I've become really frustrated with the phone since. I rooted it and flashed a custom ROM in hopes of solving the problem but it's the same deal.
I've confirmed it's not the battery either since I've got another one I've tried and only get the same results. Even with Juice Defender running I get nowhere as great a battery life as I did before the update

I'm doing decent 8hrs 20,mins on batt. With 40% left mostly text and internet browsing
Sent from my HTC Sensation 4G using xda premium

Try clicking the graph at the top of the screen it will give you another screen that shows awake/screen time etc. Is your phone going to sleep when you screen turns off?
I was having the same problem and realized that some app was keeping my phone awake even though the screen was off. I uninstalled 80% of the crap I had installed and now my phone sleeps like it should and battery lasts amazingly long time.
Tester30 said:
here are the battery stats...
Display..........74%
Cell standby...13%
Phone idle......11%
Voice calls......2%
THAT'S IT!!! Nothing else is running...... SUX...
Still gives 12 - 16 hours of life on almost idle......
Click to expand...
Click to collapse

anurbanlegend said:
Try clicking the graph at the top of the screen it will give you another screen that shows awake/screen time etc. Is your phone going to sleep when you screen turns off?
I was having the same problem and realized that some app was keeping my phone awake even though the screen was off. I uninstalled 80% of the crap I had installed and now my phone sleeps like it should and battery lasts amazingly long time.
Click to expand...
Click to collapse
How can you tell if your phone is going to sleep when you lock the screen? What is a good method for this? And if I find it its not sleeping when it should, is there a way to find the culprit easily?
Sent from my HTC Sensation 4G using XDA App

_DavidWebb said:
How can you tell if your phone is going to sleep when you lock the screen? What is a good method for this? And if I find it its not sleeping when it should, is there a way to find the culprit easily?
Sent from my HTC Sensation 4G using XDA App
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Click to collapse
Click on the graph in battery stats, it should show awake time and screen on. If your awake time is constant when the screen on time isn't, then chances are you've got an bad app somewhere preventing the phone from sleeping

my battery life was plain **** on 2.3.3., device was running hot all the time (=waste of energy), charging took ridiculous 4h+! When I took it off at the charger around 23:00 the battery was dead at 14:00 the next day with most time being idle!
Since my update to 2.3.4 things got so much better. charging takes around 2h and battery finally lasted a whole day and had 40% juice left in the evening.
Since I got my 2 Ankers+charger for 20$, battery life is crazy now. Been on one charge for 2d2h and still had 16% left. Pushmail on, wifi on (cellular data only when not at home), brigthness at 100%, taking video, pictues and some navigation, messaging and phonecalls. Oh yeah and a few minutes of flashlight use
I would say between slight and medium use.
If 2.3.4 worsened your batterylife, contact HTC or your vendor.
I now replaced the battery at 16% with the other Anker because I still need to do my 5 charge cycles on that one to calibrate it.

Here's an example of the graph. At the bottom you can see awake and screen on time. I pulled phone of charger last night, did some browsing, then ran for an hour with music playing in the background (you can see the small green bar on awake even when screen is off). After I surfed a little and left it off the charger when I went to bed. The phone is properly sleeping when the screen is off and almost 16 hours and still have 62%.
Before I uninstalled the apps, the awake time was solid green across the screen.

Anker battery worked wonders on my device. Before I would have to throw it on the charger after lunch as I like to go for a beer after work and the stock battery would never make it that far... Now when I get home from the bar I still have ~30% battery. Anker battery FTW!

flash a custom rom and u will go gaga over ur battery life. definitely works for me. on standby overnight drain 0-1%.

I found out that if you don't have strong signal at your location your battery drains pretty fast that's why I always connect my phone to WiFi at my apartment where my phone looses signal sometimes. now I lose just 1-2% of power during a night.

Sorry to hear about your battery troubles. A couple days ago I rooted and switched to "Android Revolution HD 3.0.4" and my battery life seems pretty solid. I wasn't having battery life issues prior to this though.
I'm currently in the process of calibrating the battery:
- drain it mostly
- turn off
- plug it in overnight while still off
- in the morning unplug, wait 15 minutes, replug for a few hours; do this ONLY ONCE or you may damage the battery
- power on, immediately go to recovery, advanced, reset battery stats
- start normally
- drain battery until it shuts down; a continuous stress test or stability test app is probably ideal
- once it shuts off, turn it on again to double-check that it's dead; it should only come on for a second or two
- while off, plug in and allow to fully charge; no fooling around with plugging/unplugging, just normal
- calibration complete!
I think you can follow a similar procedure (minus clearing battery stats) to refresh the battery calibration even without rooting/custom recovery. I've read the effectiveness is similar. The phone just needs to be retaught what "full" and "empty" mean, all in one charge cycle. If you calibrate it wrong you could have issues with it shutting off while still reading ~15% battery life.
Anyway, as I said, I'm in the process of doing this. Currently I'm in the "drain it" phase... with my screen at maximum brightness (remaining on), overclocked to 1.5 ghz, I've been running "StabilityTest" (from market) for one hour and fifteen minutes. It stresses both cores as well as the RAM. At this time, my battery is at around 30-40% or so, and it's getting really hot! The phone's temperature is reading as 54.8 degrees!
Also, yesterday I used the GPS for about 4 hours before it died, this was prior to any calibration attempt. I think this is within typical battery life considering that the screen stays on.
TL;DR: Maybe you just need to try a custom rom or recalibrate your battery. Miscalibrated battery can be caused by flashing/updating a rom, I imagine even when it's an OTA. Sense is crippling your phone anyway, you might as well give it a try IMHO.

get yourself an anker battery..I havent charged my phone since the day before and now i have 20% left! heavy usage
Sent from my HTC Sensation 4G using XDA Premium App

Odd battery %tage display and behaviour

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....
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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.

My battery is weird

My battery has been acting funny lately. Some nights I go to bed with the battery at 100% and when I wake up it's still at 100%. Other nights it loses 10-15% (in about 9 hours). I don't have anything running in the background that I'm aware of that would cause such a discrepancy. A couple nights ago the battery lost 10-12% overnight with the phone turned off! Still the phone was apparently awake all night. How is that possible?
I'm too lazy right now to post a screenshot since xda only accepts urls.

The same here after flashing a new custom rom.
After turning on the phone and making this screenshot percentage immediately went down for 10 to 15 %.
You can check things like that pretty good with apps like Battery Monitor Widget.

Did both of you try to recalibrate the battery?

Do a full cycle charge to 100% use it till 10% then wipe battery stats and charge phone to 100 again
Sent from my HTC One S using xda premium

k1llacanon said:
Do a full cycle charge to 100% use it till 10% then wipe battery stats and charge phone to 100 again
Sent from my HTC One S using xda premium
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Click to collapse
Why would you only go down to 10? Might as well drain the battery completely. It's not going to damage anything unless you let it sit around dead for weeks, possibly even months.

It's never good to completely drain a lion battery
Sent from my HTC One S using xda premium

k1llacanon said:
It's never good to completely drain a lion battery
Sent from my HTC One S using xda premium
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Click to collapse
Actually, for a proper cell calibration, it is best to drain the battery completely. Many agree and I have never heard a dev say that draining it dead hurts the battery. It is essential for each cell to be empty in order to properly and fully charge a li-ion battery (without this, % figures will be non-calibrated over time). Just like it is of good practice to let the device charge and extra hour or so once the indicator light turns green (to ensure 100% after trickle mode).

Rule 1: Battery calibration does absolutely nothing. Deleting battery stats will never, ever do a single thing to help your phone's battery calibration.
Rule 2: Standby drain is almost always because of partial wakelock or kernel wakelock. Install Betterbatterystats to figure out what the issue is.
Rule 3: If your phone is in a good reception area and still experiences heavy standby drain, charge the phone until it reaches max voltage (4.2 or 4.3), then use it until it shuts off, then go to hboot until it shuts off, then charge to full again, preferably with the phone off. Wait about an hour after you first see the green light to turn it on.
After that, enjoy. If you still have issues, I would suggest backing up everything and attempting an ruu flash with the battery at 100%.

I failed to mention it, but I haven't rooted or installed a custom rom.
I'll try better battery stats to see what I can find out with that.