Database Users

HOW TO: Wipe Battery stats to improve battery life

coming form other android phones, ive learned to wipe batt stats in recovery to get the best life.
normaly i wind up seeing voltage @ 100% a little over 4.260v
now on our phones we dont have that option, and i noticed while trying out diferent roms that its hitting " 100% " at various voltages depending on what the batt truely was when flashing.
if i recall the file is : /data/system/batterystats.bin that we need to delete? corect?
well, before i did it, it hit 100% @ 3.782v and wouldnt go any higher...
now, im sitting @4.246... im not 100% sure its fully charged. ill let it sit overnight turned off and see where i wind up.
UPDATE 11-20
SO, voltages have been confirmed.
100% = 4.20-4.25 depending on battery condition
0%= dependent on the kernel generaly 3.2-3.0 {found some as high as 3.7v!} thank you to hastarin for pointing the files out
if your not seeing 4.2v your not getting full battery life.

sure enough, i was sitting just shy of 4.3v this am after an overnight charge with the phone turned off...

Interesting info, but where would you find out the voltage the battery is producing?

so, how to wipe the battery stats?
time to get down and dirty and learn to navigate thru the android OS.
download and set up the android SDK
http://developer.android.com/sdk/index.html
heres a newbie guide to adb in the nexus forum
http://forum.xda-developers.com/showthread.php?t=619153
for those less computer literate, you can use droid explorer to do alot of the stuff thru a GUI. it also will set up adb for you.
http://de.codeplex.com/
the code that you type in to remove the battery stats is
Code:
rm data/system/batterystats.bin
now to properly condition the battery.
turn off the phone, plug it in, preferably overnight.
boot the phone up while still pluged in.
delete the batterystats.bin file ether thru adb or terminal
drain the battery fully, untill it powers down. wait a min or two and reboot it to completely drain it.
congrats... your phone now knows corect voltage values for 100% and dead.
Remember: Flashing a new Android build erases the battery stats, and automaticly rebuilds them based on voltages it see's .
ie: you need to recondition after each flash to get max battery life.
i use the "battery life" widget by curvefish to show me temp, voltage etc.

Slampisko said:
Interesting info, but where would you find out the voltage the battery is producing?
Click to expand...
Click to collapse
some builds will show actual voltage under menu/about phone/battery use
otherwise i use the " battery life" widget by curvefish, available for free from the market. once you add it to the screen, tap it, hit settings, then check both charging info and extended info.

after conditioning the battery, im currently @27 hours since unplugging, gps, and wifi turned on the entire time, im @ 3.873v or 61%! granted, its been light usage its my secondary phone right now, but i am on the outskirts of service, and the week signal usualy sucks the battery...
ill update again , probably this time tomorow once it finaly dies...
just a little food for thought: its been over 27 hours since i unpluged, and my voltage is still higher than what the phone assumed was 100% @ the time of the initial flash....

@ 50 hours (still 10%) i finaly got sick of waiting for it to die. i turned screen on full bright, and ran gps test and locked the screen on. phone finaly died @ 2.988v im now charging it again with the phone turned off.

Umm why do we need this though ?
Wont the phone keep running as long as there is sufficient voltage in the battery ?
What is the use of this method ?

This is for people who have found a build they are happy with and want to use for a while so that their battery lasts longer, much longer. As the OP has posted, his phone is currently lasting about as long as it does in WinMo which is an impressive feat, more so being as he's running his GPS non-stop at the same time.
I for one am going to do this myself when I get the time. If I knew whether my alarm would go off while the phone was switched off (for the overnight charge) I'd do it tonight but cannot risk being late for work tomorrow lol

Thanks Reno but I meant HOW does it work ?
I thought this method just helps you see your battery's percentage .. Wont the battery run no matter what the percentage show as long as the battery has a charge ?
Can someone please explain this ?
Yeah I cant afford not waking up late as well, so im charging it while its on, would that affect anything ?
It will still charge up the battery wouldnt it ?

as stated in the op.... when you flash a build, android assumes whatever that voltage is =100% so if you realy only have 50% (about 3.7v) thats all it will charge to...
100% is realy 4.2v , this recalibrates it to alow it to fully charge.
do they not teach reading comprehension now a days? its not just this thread... its the whole forum!

Oh ok thanks ! Makes sense ..
Well I charged my phone during the night while it was switched on, in the morning the battery stated it has 4.212mV
Do I need to recalibrate it ?

recalibrating cant hurt.

For those of you who are using droidexplorer.... when right clicking on batterystats.bin and selecting delete the file does not disappear... is this how its suppose to be? If that is not suppose to happen then where exactly do you type "rm data/system/batterystats.bin"

in the console

for what its worth: Li-Io battery technology realy isnt different whether it be a phone, rc car, etc...
our batterys are a single cell. ie: rated 3.7v
4.2-4.25v is concidered by the industry as fully charged
3.7v is nominal voltage
3.2v "shorted" voltage : ie: voltage sag due to max discharge @nominal voltage
3.0v discharged
2.5v protection circuitry kicks in.
this jives with what i am now seeing on my phone after wipeing stats and calibrating...
it is also a industry standard to fully discharge ( 3.0v )about every 30 discharge cycles.
people please post what you are seeing for voltages 100/0 % before complaining about battery life.

ducvader said:
For those of you who are using droidexplorer.... when right clicking on batterystats.bin and selecting delete the file does not disappear... is this how its suppose to be? If that is not suppose to happen then where exactly do you type "rm data/system/batterystats.bin"
Click to expand...
Click to collapse
So this ^^^^ is the adb command?
Then I would type in
adb devices
rm data/system/batterystats.bin
Is this right,or is there any other commands I need after I put in adb devices?

very interesting
maybe i should try it..

4.2v @100%

This is just a quick question from a bit of logical thinking really...
Once we've got a properly calibrated Batterystats.bin file, can we back that up and use it with other builds?
Can we also therefore share it with other peoples phones as well?

Simplest way to calibrate your Battery [for root users only]

I noticed that in CWM 3 (on gingerbread running device), when u click on wipe battery stats in CWM, Nothing happens while in old CWM's when we use to click on wipe battery stats, we get a message "battery stats wiped successfully".
So to wipe my battery stats, i found a software in android market called "battery calibration"
Just download this software from market (its free) and you will get your results.
https://market.android.com/details?id=com.nema.batterycalibration&feature=search_result

I plugged in the cable to get to 100% charge (4250mV), I clicked "Battery Calibration" then waited until it was done and unplugged the phone. Then it was at 99% wtf. What does this mean? Is my battery calibrated now or what?

Multiple posts on here full battery reads 100-97%
Battery is only calibrated after battery stats wiped battery drained and charged to 100% then phone used for two weeks .
jje

JJEgan said:
Multiple posts on here full battery reads 100-97%
Battery is only calibrated after battery stats wiped battery drained and charged to 100% then phone used for two weeks .
jje
Click to expand...
Click to collapse
Thanks for the info, man. So, now that I have calibrated with this app, I just have to drain the battery to 0% - then the phone turns off automatically - and recharge till 100%, then it's calibrated? Woah
PS: Do i have to recharge my phone while it is on or better while it is off?

Galaxy S 2.2.1 firmwares never show 100% battery life when not on charger. As soon as u unplug ur charger the level will drop to 96% or something. Reconnect ur phone to charger again and after 5 mins it ll again show 100% than again as soon as u unplug it, the level drop down to anywhere more than 96%.
just untick wait for 100% option in battery calibration software and ur battery ll be calibrated. do once ur phone is fully charged and once when ur battery level is just 1-2%

Actually its down to the modem version you run.
I ran one modem version that gave me excellent battery life (near on two days of constant use and only 50% drain. Also it STAYED at 100% for about 20 minutes after unplugging if i didnt use the phone, when i used this modem.
The problem is that to get better battery life you have to compromise on signal quality on the modem. The less battery the modem uses usually results in less signal strength, because its not using as much power to find its mast.

read #11 in "Getting the most out of your SGS" thread. That section is on why it's not good to overcharge your battery.
11. Do NOT overcharge
--Why, when, where: Almost all new batteries have an overcharging protection. This means that the protection that is built into the battery will not let it charge to 100%. This is a feature, not a bug! This will help prolong your battery life while also keeping it safe from overheating/explosion/etc. Do not try to trick it and unplug and plug again until you see 100%, just get used to the fact that you can't have 100% battery anymore and live with it, or you risk destroying your battery.

My device only goes upto 4170mV.
Anybody has the same issue?

[Q]The truth about defy+ battery fixes

PLEASE READ CAREFULLY BEFORE YOU POST!!!!
Hello!!
i wish to know if someone could charge his defy+ to 100% with some of those fixes in froyo rom.
The thing is that some fixes charges to 100% BUT is not the defy+ 100%, those fixes make the phone use the battery like a normal defy one. But doesnt charge it to the real value in mV
defy full mv charge : ~4160mV
defy+ full mv charge : ~4320mV
So is there someone who using some fix could charge his defy+ to the REAL defy+ value? it doesnt matter if it says 100%, the thing is to check the mV.

The truth, to relate to your title, is in fact, that there is no fix that works for everyone...
I've read a lot on the original German topic for white rabbit, and the author Einsteinno tried to implement such a fix with a little help from his fellow beta-testers.
The conclusion was, that for almost everyone who tried any of the fixes another one or none worked... Maybe it's the build of their Defys, maybe bootloader or kernel or something else.
It seems you have tried a few and if none off them worked so far, you might have to wait a little longer...
Greetz, Unr3aL67
Sent from my Defy via Tapatalk

a little more detail plz
hi,
I know i may be sound dumb here...
but i have been trying to figure out this battery issue by going through as many threads as i could...
still as confused as before if not more....
if someone could suggest some solution ...
would be of great help....
issue:
i am on cm7 0412 build ....
battery drops from 34 to 19....
how do resolve it???
Is there a fix???

Please use the Q&A Forum for questions &
Read the Forum Rules Ref Posting
Moving to Q&A

after changing lots of rom i finally stayed some time on miui pikachu edition and i had the 83% battery charge.. then i tried with some fixes and it displaied 100% but the real value wasn't around 4300..
then i decided to flash a full sbs, charge my phone till real 100% and then install cm7 white rabbit! till then, i get always full charge!
hope i help you
bye

I have got a fix I tried that some one tried on MIUI and they say it worked and as far as I know thats froyo based?? Any way give it a go but back up your original battd.bin (copy it to a SD card location) incase it fails so you can restore it.
Here is the link the fix and instructions is last post on page one. Please post on that thread if it works for you and what version your running.
http://forum.xda-developers.com/showthread.php?t=1625504

I would guess that both batteries are fully charged at the same voltage ~4.2V - However you need to be carefull when you measure the voltage. Use a Multimeter and try to draw some current and measure while you do it I bet the voltages will differ.
The thing that differs on the batteries are the capacity (mAh), which in no way translates to fully charged Voltage. (lower than 4.2 does however say something about how much charge is remaining, but the discharge curve is pretty flat)
A battery charge circuit typically detects the fully charged capacity by measuring that the voltage no longer increases (and then continue to trickle charge for a while to get it fully charged).
EDIT: spelling

daede86 said:
after changing lots of rom i finally stayed some time on miui pikachu edition and i had the 83% battery charge.. then i tried with some fixes and it displaied 100% but the real value wasn't around 4300..
then i decided to flash a full sbs, charge my phone till real 100% and then install cm7 white rabbit! till then, i get always full charge!
hope i help you
bye
Click to expand...
Click to collapse
On cm7 everyone gets full charge. Its the MIUI (Pikachu n WIUI) that has the problem
Sent from my MB526 using XDA

http://forum.xda-developers.com/showpost.php?p=25889047&postcount=19
Here is some info i postin the link from above

What's the difference between the battery indicator while the phone is turned off and the one when it's turned on?
I own a Defy (Red lens) and have CM9 (Defy+) with its batteryfix. However, strange things happen with battery measurement:
-Turned off it shows 100%, and when I turn it on, it shows 89% or so.
-I plugged it when it was on 8% (turned off), and as soon as the battery indicator showed, it said "45%".
Now I'm charging it (turned on) and it shows 96% and 4146mV in BatteryCalibration (I understand this is ok).
I'm curious about it, and also a bit afraid of damaging my battery.

jpl90 said:
What's the difference between the battery indicator while the phone is turned off and the one when it's turned on?
I own a Defy (Red lens) and have CM9 (Defy+) with its batteryfix. However, strange things happen with battery measurement:
-Turned off it shows 100%, and when I turn it on, it shows 89% or so.
-I plugged it when it was on 8% (turned off), and as soon as the battery indicator showed, it said "45%".
Now I'm charging it (turned on) and it shows 96% and 4146mV in BatteryCalibration (I understand this is ok).
I'm curious about it, and also a bit afraid of damaging my battery.
Click to expand...
Click to collapse
May be you could do a quick calibrate by the app Battery Calibrator from app store.

farsight73 said:
May be you could do a quick calibrate by the app Battery Calibrator from app store.
Click to expand...
Click to collapse
I forgot to mention it, but I already did it as soon as I installed CM9...
Thanks!

[Q] Battery percentage/calibration PROBLEM

Hy Guys,
I have a problem with my Defy's battery (not exactly with it.)
If I fully charge it, it "drains the battery" fast and when it says 1% reaming, it lasts about half of the battery time.
So, I tried to use battery calibrators, delete the batterystats file, but nothing. My battery is new and as I said IT LASTS A LONG TIME? BUT WITH BAD PERCENTAGES.
Please help me, because it's so damn annoying

Battery
ToMpI97 said:
Hy Guys,
I have a problem with my Defy's battery (not exactly with it.)
If I fully charge it, it "drains the battery" fast and when it says 1% reaming, it lasts about half of the battery time.
So, I tried to use battery calibrators, delete the batterystats file, but nothing. My battery is new and as I said IT LASTS A LONG TIME? BUT WITH BAD PERCENTAGES.
Please help me, because it's so damn annoying
Click to expand...
Click to collapse
I think best combo is full discharge + full%charge (and 1-2 hours more connected after 100%) and then reboot in recovery to clean battery stats.
The battery need autocalibrate with full charging cycles.

please search Battery Calibration app on Play. Use it after dropping battery stats.

I got this screenshot of my battery drain. There are random drops and I didn't use my phone at that time.

Terrible problem battery

Hi!, im terrible problem for my battery
a long time (1 month) i bought two batteries for nexus 4 Originals, but the two battery only charged to 91% (long time jump direct to 100%) but low charged 9% without reazon
im try all for the solution the problem:
Reinstall kitkat 4.4.4 from adb
Franco kernel
CWM don't option wipe battery
Calibrate battery too, failed.
ideas please, im desesperate.
Sorry for my poor english

hiroki-bass said:
Hi!, im terrible problem for my battery
a long time (1 month) i bought two batteries for nexus 4 Originals, but the two battery only charged to 91% (long time jump direct to 100%) but low charged 9% without reazon
im try all for the solution the problem:
Reinstall kitkat 4.4.4 from adb
Franco kernel
CWM don't option wipe battery
Calibrate battery too, failed.
ideas please, im desesperate.
Sorry for my poor english
Click to expand...
Click to collapse
I would like to suggest you to check the batteries properly. Buy the authenticated once.
first flash the stock image and check the battery on it

Rohit02 said:
I would like to suggest you to check the batteries properly. Buy the authenticated once.
first flash the stock image and check the battery on it
Click to expand...
Click to collapse
hi! the batteries was originals with serials and dates 2014.
and how to check these batteries?
Greetings

daviduco said:
Factory reset and don't install apps. Then check battery usage.
Click to expand...
Click to collapse
good idea? im try this in 5 hours, check the battery and tell results.

hiroki-bass said:
Hi!, im terrible problem for my battery
a long time (1 month) i bought two batteries for nexus 4 Originals, but the two battery only charged to 91% (long time jump direct to 100%) but low charged 9% without reazon
im try all for the solution the problem:
Reinstall kitkat 4.4.4 from adb
Franco kernel
CWM don't option wipe battery
Calibrate battery too, failed.
ideas please, im desesperate.
Sorry for my poor english
Click to expand...
Click to collapse
first of all try a battery calibration program like this: https://play.google.com/store/apps/details?id=com.nema.batterycalibration&hl=en
maybe it is a calibration problem.
as far as i know batter stats are not erased with a factory reset
then try an app like this :https://play.google.com/store/apps/details?id=ccc71.bmw&hl=en
it should tell you the battery capacity and see if everything is working as it should.
good luck! i hope that will solve your problems, or at least find out what your problem is!
P.S. if it is an app related problem, or wakelock related you can find it with betterbattery stats.
http://forum.xda-developers.com/showthread.php?t=1179809

That battery calibration app is a placebo. The batterystats.bin file doesn't do anything to change the microcontroller inside the battery pack itself.

nowster said:
That battery calibration app is a placebo. The batterystats.bin file doesn't do anything to change the microcontroller inside the battery pack itself.
Click to expand...
Click to collapse
And I do that?

hiroki-bass said:
And I do that?
Click to expand...
Click to collapse
Allow the phone to discharge fully until it turns itself off, by normal use and not using a battery draining app (or a benchmark). Then charge slowly and continuously until full, without making the battery hot, eg. by USB port on computer.
If you discharge too quickly you risk getting the red light of doom.

nowster said:
Allow the phone to discharge fully until it turns itself off, by normal use and not using a battery draining app (or a benchmark). Then charge slowly and continuously until full, without making the battery hot, eg. by USB port on computer.
If you discharge too quickly you risk getting the red light of doom.
Click to expand...
Click to collapse
ok, i will try it [emoji106]

nowster said:
Allow the phone to discharge fully until it turns itself off, by normal use and not using a battery draining app (or a benchmark). Then charge slowly and continuously until full, without making the battery hot, eg. by USB port on computer.
If you discharge too quickly you risk getting the red light of doom.
Click to expand...
Click to collapse
I missed it just a little, I got to 98% charge, but a few minutes and quickly under 93%. It is a breakthrough.
it was with a single USB cable charge (not data), lest appears the red light of death
tonight will try only usb cable data.
Greetings

hiroki-bass said:
I missed it just a little, I got to 98% charge, but a few minutes and quickly under 93%. It is a breakthrough.
it was with a single USB cable charge (not data), lest appears the red light of death
tonight will try only usb cable data.
Greetings
Click to expand...
Click to collapse
Last few percent takes longer to charge, I think this is by design. Mine behaves the same way.

nowster said:
Allow the phone to discharge fully until it turns itself off, by normal use and not using a battery draining app (or a benchmark). Then charge slowly and continuously until full, without making the battery hot, eg. by USB port on computer.
If you discharge too quickly you risk getting the red light of doom.
Click to expand...
Click to collapse
ok, i try usd cable and the result is equals the charger that only provides electricity only reached 98% in 30 minutes and under 93%
Halp me