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battery calibration

For my HTC Hero, people on the boards recommended wiping battery stats and fully draining the battery for a couple of cycles.
Is it recommended for the Gtab as well? Are you able to wipe battery stats on this thing?

clankfu said:
For my HTC Hero, people on the boards recommended wiping battery stats and fully draining the battery for a couple of cycles.
Is it recommended for the Gtab as well? Are you able to wipe battery stats on this thing?
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If you flash clockworkmod you can wipe battery stats.

What exactly does wiping battery stats do? My gtab never charges past 97%. Would this re-calibrate it so that full charge showed 100%?
It's not even a minor annoyance so I'm not intetrested in anything requiring me to drain completely but if this is a simple fix I would give it a go.

I have the same problem...battery won't charge past 96%. I've charged it overnight and wiped battery stats with no success. Any ideas how to fix this??
Vegan 5.1.1

Same issue here, sadly. First time charging, it got up to 100%. After that now though, it stops charging at 98%. No amount of bump charging, battery stat wiping, draining battery, etc, has seemed to work.

It charges to 100% when using it while plugged in. I mean if it matters to you to see the big 100 once in a while ;-)

Not for me, lol. Meh, not a HUGE deal, but kind of a bummer.

Mine has the same issue. Charged overnight while powered on and while powered off and the highest the battery meter reads is 98%. I have attempted to wipe the battery stats, completely drain the battery, and wipe user data- all to no avail. While slightly irritating, it really seems as if the battery is functioning normally and the breakdown is simply the calibration of the software. I am easily getting 6-8 hours depending on usage.

Mine did that as well in the beginning, but after a bunch of good charge discharge cycles charges to 100%.

Battery Calibration - Once and for all!

I have read every possible thread you can imagine on battery calibration and can never seem to do this correctly, is it a myth? No matter what I do, if I restart my phone, I end up going from 100% down to 85-86% EVERY SINGLE time.
This is after "bumping it". (letting it drain all the way to 0% and then fully charging again).
This is after using BATTERY CALIBRATION in the market which was told works well. (again, advises you charge to 100% then "calibrate" it via the APP).
This is after charging it to 100% and restarting it, recharging up to 100%, restarting and recharging (repeat, repeat, repeat), and then going into bootloader and wiping battery stats.
None of these have worked, does someone have a sure fire EXACT way to do this properly or is at ALL just hype? Help.

Your battery will never say 100% after a reboot. It sucks up a lot of juice on a power up and the battery doesn't charge during powering on. I usually drop about 10% on a reboot using the rezound battery. That is normal behavior. If you can charge to 100% with the phone on then you're fine.
Sent from my ADR6400L using Tapatalk

Interesting because I've never lost 15-16% consistently although I guess it using some juice to cycle makes sense. Anyone else seen 10+ every restart? Thanks for the help man in either case.

Hmm, never seen this before. On my phone which is running skyraider uc to 768mhz and uv only loses 1percent on reboot or doesn't even lose charge at all. Not sure why your phone is doing that.
Sent from my ADR6400L using xda premium

I am running G3D uc to 768mhz and on restart I may lose 1 - 5% at most depending on if i made any changes that take a longer restart. I bet you are overclocked? no need, under clock to 768mhz and your phone will run as smooth as 1.2mhz..maybe smoother while using less battery

Running liquid 3.2.1 on my T-Bolt with the Rezound battery and I only lose 1% battery at boot up. Never lost more...oh and I have never calibrated my battery. Also I get about 8-10 hours of moderate to heavy use too. All stock clocks btw

Just to double check - or reword... do it this way - if you aren't already.
Charge to 100%.
Wipe Batt stats
Drain to zero without recharging in any way (AKA let it drain until it shuts off on you).
Recharge until 100% (till it says 100%, not just "green."). And unplug.
And you're good! Try that and check back in.

Battery Calibration doesn't work

Ignore the % number, it means nothing. Use the battery monitor widget or another program that will show you the actual battery voltage. A fully charged battery will be somewhere around 4200 mV and a discharged battery between 3600 and 3200 mV. I've also noticed that the rezound battery throws things off as the mAh rating doesn't match up to either of the thunderbolt batteries. This is why the battery monitor widget shows the rezound battery as 2750 mAh instead of 1620.

What I recommend to my Evo peeps [which I have] is this:
-Charge battery to 100%
-Wipe battery stats in recovery
-Let the battery drain, so it manually powers off
-Charge to 100% again, and good to go

Battery Calibration doesn't work
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By this I mean Google Developers have came out recently and said battery calibration does not increase or have any effect on the state of battery life. All wiping the battery stats does is wipe the stats as to what has been using the battery, etc.
still handy for when you flash a new rom to wipe the stats, but it doesn't improve battery life at all.

smoody said:
By this I mean Google Developers have came out recently and said battery calibration does not increase or have any effect on the state of battery life. All wiping the battery stats does is wipe the stats as to what has been using the battery, etc.
still handy for when you flash a new rom to wipe the stats, but it doesn't improve battery life at all.
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Actually, the post from Dianne @ Google said nothing about calibration. She only talked about wiping or deleting the battery stats file.

You are correct, however all the battery calibration apps available only delete the battery stats file. So like I said it doesn't affect battery life.

wherestheboost said:
Just to double check - or reword... do it this way - if you aren't already.
Charge to 100%.
Wipe Batt stats
Drain to zero without recharging in any way (AKA let it drain until it shuts off on you).
Recharge until 100% (till it says 100%, not just "green."). And unplug.
And you're good! Try that and check back in.
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Click to collapse
This is what I thought I had done but will do again. The problem is even after its 100% and in between your 1st and 2nd step when I reboot into recovery, it's no longer at 100% and sometimes down to 85%ish. I will try again tho, thanks!

http://rootzwiki.com/_/articles/wiping-battery-stats-is-pointless-says-google-r316
That pretty much says it. Wiping stats and calibrations are placebos.

l7777 said:
That pretty much says it. Wiping stats and calibrations are placebos.
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Yeah I read that too. But when I flashed my first rom on the tb I got abysmal battery life. 25% in like 20 min. I recalibrated and it got so much better. If its a placebo its a good one.
Sent from my HTC ThunderBolt using Tapatalk

all that says is the the deleting the batterybin file doesn't help. The battery is handled by each by software outside of android itself. So, following the battery calibration from the manufacturer of your phone still might help.

jefferyriess said:
Yeah I read that too. But when I flashed my first rom on the tb I got abysmal battery life. 25% in like 20 min. I recalibrated and it got so much better. If its a placebo its a good one.
Sent from my HTC ThunderBolt using Tapatalk
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25% in 20 minutes means nothing. The % is an estimated number. Find an app that reads the battery voltage if you want a true reading on the battery's charge. Full is 4.2 volts, dead is between 3.0 - 3.6 volts. Battery life should only be measured in hours from full to dead. I've seen my phone stick on 100% for several hours before as well as sticking at 20% for several hours. Ignore the %. Anyone spending all day looking at a % to judge their battery life should go back to a battery indicator that doesn't show %.

[P] Phone is charging itself?

Hello. This issue has been going on for a while now. But when I take my phone off the charger when its not fully charged. The battery percentage keeps going up. For example if I unplug it at 78%, the percentage will gradually go up to like 86-88%. Can anyone give me a hint as to why its doing this? Thanks!
Sent from my SAMSUNG-SGH-I727 using XDA

MrTenseJACOB said:
Hello. This issue has been going on for a while now. But when I take my phone off the charger when its not fully charged. The battery percentage keeps going up. For example if I unplug it at 78%, the percentage will gradually go up to like 86-88%. Can anyone give me a hint as to why its doing this? Thanks!
Sent from my SAMSUNG-SGH-I727 using XDA
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Battery stats are wonked out.
Do you have Clockwworkmod recovery installed? Or is this a pure stock unrooted?
EDIT: Mr. Jacob, what are you tense about? LOL ! Just kidding....

Try using an app called battery calibration (can be found in the app market) when the phone is fully charged. This will reset all the battery stat logs and set your 100% to a true 100%

I have clockwork installed. I'm running SkyICS rom. And I have already tried battery calibration.
PS: And nothing really xD its been my screen name since the early Xbox days
Sent from my SAMSUNG-SGH-I727 using XDA

Battery calibration does nothing. Normally I wouldn't recommend that u COMPLETELY drain the skyrocket battery as its lithium based and can cause dead cells, yours needs calibrating, and wiping battery stats or using a battery calibration app won't help (both of these are myths by the way, Google if). Use phone until its completely dead, and won't turn on at all, only vibrate with a black screen. Then charge phone for a continuous 8 hours uninterrupted, that should fix it

MrTenseJACOB said:
I have clockwork installed. I'm running SkyICS rom. And I have already tried battery calibration.
PS: And nothing really xD its been my screen name since the early Xbox days
Sent from my SAMSUNG-SGH-I727 using XDA
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As a first try, charge to 100%. Then go into CWM recovery and wipe battery stats. It should be good to go....On ICS, thsi seems to fix it for me.
IF you then stilll have weird battery problems a proper recallibration will be in order.
I had to just wipe battery stats when charged to 100%. DON'T just wait for 100%. Alow the phone to get to fully charged.....if you have "Full Charge" notification on your ROM wait for that.

chappatti said:
As a first try, charge to 100%. Then go into CWM recovery and wipe battery stats. It should be good to go....On ICS, thsi seems to fix it for me.
IF you then stilll have weird battery problems a proper recallibration will be in order.
I had to just wipe battery stats when charged to 100%. DON'T just wait for 100%. Alow the phone to get to fully charged.....if you have "Full Charge" notification on your ROM wait for that.
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Half of this is right chappatti
charging to 100% and letting it sit for at least an hour even after full charge notification is the best way. Wiping battery stats in cwm won't actually do anything though, thats a myth.

Actually, for lithium ion batteries, it is not recommended to let them discharge to zero. It's better to run it down to 10% or so (i usually do about 5%). and then charge it completely. Rinse and repeat over a few days, and there should be a difference.
http://batteryuniversity.com/learn/article/how_to_prolong_lithium_based_batteries
Sent from my SAMSUNG-SGH-I727 using Tapatalk

icenight89 said:
Half of this is right chappatti
charging to 100% and letting it sit for at least an hour even after full charge notification is the best way. Wiping battery stats in cwm won't actually do anything though, thats a myth.
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Yup, ice, ur are right. Wiping stats is not about battery charging stats....
https://plus.google.com/u/0/105051985738280261832/posts/FV3LVtdVxPT
What a revelation !! It's like realising my religion is all wrong !
BUT, BUT, BUT : reading the whole battery stats discussion, it i also clear that the business of charging for an hour after 100% is also not worthwhile, but is just a customer gimmick to make people feel thier batteries are topped off. This was started by HTC and the consensus is that is also does not help.
The simple solution is to let the battery go through 2-3 charge-discharge cycles.

Saitou33 said:
Actually, for lithium ion batteries, it is not recommended to let them discharge to zero. It's better to run it down to 10% or so (i usually do about 5%). and then charge it completely. Rinse and repeat over a few days, and there should be a difference.
http://batteryuniversity.com/learn/article/how_to_prolong_lithium_based_batteries
Sent from my SAMSUNG-SGH-I727 using Tapatalk
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A good read. Very useful, thanks !

I had this same issue with my Exynos G2, my problem was flashing different roms or putting a theme on. My fix came not by wiping battery stats but only doing flashes at 100% and plugged in. I never noticed it on my SR though. I'm not saying don't try what the others say, just giving you more options.

[Q] Battery Calibration

Can you guys recommend a battery calibration app?
Currently im using ViperSaga, and yes we all know that our DS can live for a day or two depends on the usage.

Battery calibration by wiping battery stats is a myth. After 2-3 charge cycles, the indicated battery level will be as accurate as it ever will or can be.

Battery booster maybe ?

AOSP developer Dianne Hackborn has made it clear that battery calibration is a myth. It only mean deleted the battery stats. And your device does that on each reboot.

how about the wipe battery stats in the recovery? does it help the calibration of the battery?

eisenger said:
how about the wipe battery stats in the recovery? does it help the calibration of the battery?
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Battery calibration does exactly that. It wipes the battery stats. And that is something your phone does automatically on each reboot.

Deleting stats is pointless indeed, but the battery calibration procedure that involves a discharge/recharge cycle, not only deletion of the stats file helps to have proper % indication that cannot happen on a Stock ROM which is the case the Google engineer is talking about. But when flashing custom is another story, then a wrong indication can appear after flashing and it has to be corrected
Sent from my HTC Desire S

Though you can leave out wiping the battery, stats, the charge/discharge cycle is what helps.

teadrinker said:
Though you can leave out wiping the battery, stats, the charge/discharge cycle is what helps.
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Yes, including the final charging of powered off phone, that was posted in several threads lately by the same user
Sent from my HTC Desire S

How to Wipe Battery Stats On Nexus S

Hello guyz,
I want to wipe battery stats of my nexus s but there is no option like that in cwm>Advance>Battery Wipe Stats
Can anybody help me in this?Thx

don't ... it's quite useless
( there are tons of app,but u can also charge to 100% and battery stats are deleted automatically, or pull out battery, anyway it doesn't affect battery life ... )

Yeah as the last poster said, a Google person came out and busted the myth that wiping battery stats helps in batterylife/precise readings. The stats wipe on their own after each cycle, I don't know exactly how long those cycles are but most likely after full charges/a day or two etc.
Its best to just let it be and it will calibrate itself.
But if you really want to the batterystats.bin file is located in the system or data folder in the root directory, delete it and it will automatically start a new one.

I wan to wipe battery stats of my nexus s bcaz it's not fully charging to 100% Only charging to 98% and saying fully charged.Today i have flashed a new rom and now it's charging to only 95%.What the heck problem it is

rakeshbro said:
I wan to wipe battery stats of my nexus s bcaz it's not fully charging to 100% Only charging to 98% and saying fully charged.Today i have flashed a new rom and now it's charging to only 95%.What the heck problem it is
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Some ROMs have a ceiling for charging the battery in order to 'preserve the battery' so it doesn't completely die as fast. So they make it so that it can't charge all the way to 100%
So its not an actual problem on your phone and wiping stats won't help you
However if you still want to be able to charge to 100% you can download nstools which has an option to fully charge
Sent from my Nexus S using xda app-developers app

kriout said:
don't ... it's quite useless
( there are tons of app,but u can also charge to 100% and battery stats are deleted automatically, or pull out battery, anyway it doesn't affect battery life ... )
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Click to collapse
abccg said:
Yeah as the last poster said, a Google person came out and busted the myth that wiping battery stats helps in batterylife/precise readings. The stats wipe on their own after each cycle, I don't know exactly how long those cycles are but most likely after full charges/a day or two etc.
Its best to just let it be and it will calibrate itself.
But if you really want to the batterystats.bin file is located in the system or data folder in the root directory, delete it and it will automatically start a new one.
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Click to collapse
frenchie007 said:
Some ROMs have a ceiling for charging the battery in order to 'preserve the battery' so it doesn't completely die as fast. So they make it so that it can't charge all the way to 100%
So its not an actual problem on your phone and wiping stats won't help you
However if you still want to be able to charge to 100% you can download nstools which has an option to fully charge
Sent from my Nexus S using xda app-developers app
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Click to collapse
Ok guyz thx for ur post and ur time.

Batterystats is nonsense. Batterystats are wiped every time you charge your phone to full or almost full. It makes no sense to wipe battery stats with an app. Fully charging your phone and letting it turn itself off because its empty works best!
Me Gusta!

I used an app called battery calibration..
Sent from my Nexus S using xda app-developers app

rakeshbro said:
I wan to wipe battery stats of my nexus s bcaz it's not fully charging to 100% Only charging to 98% and saying fully charged.Today i have flashed a new rom and now it's charging to only 95%.What the heck problem it is
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Click to collapse
I had the same issue when i was using stock google ICS/JB ROM.
It disappeared when i made the switch to CM.
No need to delete batterystats.bin

Just flash kernel with blx