Database Users

Wiping Battery Stats Doesn't Fix or Increase Battery Life.

Yup, I said it. Nothing. Nada. Zip. Well, deleting the .bin file does do something...it resets the battery stats. Wanna know what else resets the stats?? Charging your phone to 100%. So, whatever benefit you saw from deleting the .bin was a placebo effect. Don't get me wrong, deleting it won't hurt anything. But it doesn't help anything either, and it certainly doesn't calibrate your battery. The only thing that file contains are stats, such as:
1. info about wakelocks
2. info about partial wakelocks
3. info about screen on time
4. info about screen brightness
I'm tempted to get into how lithium ion cells work, but that is a boring subject. I will say that li-ion cells don't have a memory to them, so there really isn't a "calibration" process. I will say that if you have piss poor battery life, you should consider the following:
1. An application/process that isn't allowing the phone to sleep correctly (keeping this general)
2. Any SamSprint firmware or derivative thereof
3. Knock it off with the overclocking. If you wanna screw with frequency tables and voltages, or let someone else do it and flash their kernel, be my guest. But don't ***** about your battery life if you do
4. YOUR BATTERY!!!!
Wanna know how I fixed the ****ty battery life on my girlfriend's Epic? I bought her a new battery I nice new shiny Epic Touch 4g battery with 20% more capacity and BAM, 2 days of battery life easily instead of 4-5 hours.
Seriously though, so many things affect not only battery life, but battery lifespan e.g. age (many users have had this phone for 1.5 years), # of charge/discharge cycles, excessive heat or cold (I bet a lot of people keep their phone in their pocket or a purse, huh?), etc. And while there may be quality control standards in the battery manufacturing process, not all batteries are equal and it's very possible that a battery was well below its stated capacity even when it was brand new.
Anyway, I'm tired and I need a coffee. I'm interested to hear others chime in and add to the discussion. Flame on! jk
Ryan

Crap! This was supposed to go in general... Mods, please move

This is what I've been saying all along. You put a battery in. You charge it. End of story.
All these people wasting literally hours upon hours on "calibrating" their battery are tools who should not be members of a development forum.
http://www.androidcentral.com/wiping-battery-stats-doesnt-improve-battery-life-says-google-engineer

zeppelin481 said:
Crap! This was supposed to go in general... Mods, please move
Click to expand...
Click to collapse
lol was gonna say, the only flaming you should get for this is for being in the wrong section!

Specialksg1 said:
lol was gonna say, the only flaming you should get for this is for being in the wrong section!
Click to expand...
Click to collapse
It was a total accident. I had a thread I was writing and the session expired. Lost the whole thing. Rewrote and didn't pay attention to the section. I expect to be flamed for it

zeppelin481 said:
Crap! This was supposed to go in general... Mods, please move
Click to expand...
Click to collapse
maybe if you drank your coffee you wouldn't make noob mistakes!

I saw you asked to be moved to general, that was my first question as well

Many people will argue that wiping battery stats is actually WORSE for battery life while using the same battery. After cycling perhaps. I think switching batteries requires a stat wipe though.

ksmullins88 said:
maybe if you drank your coffee you wouldn't make noob mistakes!
Click to expand...
Click to collapse
You're probably right. And I technically had 2 cups today, just not my usual gallon! I hope a mod moves it soon because I feel like a huge tool now...

zeppelin481 said:
You're probably right. And I technically had 2 cups today, just not my usual gallon! I hope a mod moves it soon because I feel like a huge tool now...
Click to expand...
Click to collapse
Lol! Hey at least it wasn't a completely idiotic thread like some of the people post in developement so you get at least 1 point for that... on topic... completely agree anybody that sees better battery life after Calibrating their battery just didn't use their phone as much after doing so... now maybe everybody will quit telling the people with bad battery life to calibrate and it will fix their issues...
Sent from my SPH-D700 using Tapatalk

Here we go...
Wiping battery stats has NOTHING to do with battery 'life'. It does however effect time from a full charge if charged from the epic itself.
What the file that is removed does it tell android what the battery level is for logging and status info. When something changes like the battery strength (age) or life change from the rom/kernel/tweaks then you need to delete that file or else it will assume the older setup is used as a norm. Android uses the data to tell the battery to stop charging at a level of 95ish% and also to power down at 5ish%. If these values are incorrect the phone won't keep a charge as log or power off earlier.

zeppelin481 said:
You're probably right. And I technically had 2 cups today, just not my usual gallon! I hope a mod moves it soon because I feel like a huge tool now...
Click to expand...
Click to collapse
Lmao, I hope they leave it in here just because
Sent from my SPH-D700 using XDA App

marcusant said:
Here we go...
Wiping battery stats has NOTHING to do with battery 'life'. It does however effect time from a full charge if charged from the epic itself.
What the file that is removed does it tell android what the battery level is for logging and status info. When something changes like the battery strength (age) or life change from the rom/kernel/tweaks then you need to delete that file or else it will assume the older setup is used as a norm. Android uses the data to tell the battery to stop charging at a level of 95ish% and also to power down at 5ish%. If these values are incorrect the phone won't keep a charge as log or power off earlier.
Click to expand...
Click to collapse
But this is right... sometimes if you don't clear your battery stats your phone still thinks you have, for example, say 75%, when you really have something less, like 50%. Thus when you charge it, it will think its charging to 100 from 75 rather than from 50. Leaving you 25% less battery or whatever and your phone will seem like its dying faster. Only because you haven't "fully" charged the battery. So in some cases, calibrating the battery by removing the file is neccessary.
Sent from my SPH-D700 using XDA App

Moved......NooB

marcusant said:
Here we go...
Wiping battery stats has NOTHING to do with battery 'life'. It does however effect time from a full charge if charged from the epic itself.
What the file that is removed does it tell android what the battery level is for logging and status info. When something changes like the battery strength (age) or life change from the rom/kernel/tweaks then you need to delete that file or else it will assume the older setup is used as a norm. Android uses the data to tell the battery to stop charging at a level of 95ish% and also to power down at 5ish%. If these values are incorrect the phone won't keep a charge as log or power off earlier.
Click to expand...
Click to collapse
This. End of story, wiping does help in certain cases.
Sent from my SPH-D700 using xda premium

Next time someone complains about battery life I'm gonna tell em to order an epic touch battery, its really the only way
Sent from my SPH-D700 using xda premium

Battery stats do nothing... I never charge my battery. I swap out with charged batteries. You can NOT make your power on time longer with battery stats!!! I've proved that with swapper batteries versus charging and wiping stats... It's a myth only because there is a file which tracks status. That file is rewritten to and reset everytime I swap batteries.
IT'S A MYTH!!!
Sent from my SPH-D700 using XDA App

troyolson92 said:
Battery stats do nothing... I never charge my battery. I swap out with charged batteries. You can NOT make your power on time longer with battery stats!!! I've proved that with swapper batteries versus charging and wiping stats... It's a myth only because there is a file which tracks status. That file is rewritten to and reset everytime I swap batteries.
IT'S A MYTH!!!
Sent from my SPH-D700 using XDA App
Click to expand...
Click to collapse
This. The battery stats contain nothing about your battery percentage. Those who think that are misinformed.

I thought the percentage is directly related to the voltage left on the battery. So how could any stats affect that?

xopher.hunter said:
Next time someone complains about battery life I'm gonna tell em to order an epic touch battery, its really the only way
Sent from my SPH-D700 using xda premium
Click to expand...
Click to collapse
Look out! Here comes the Peanut Gallery! But seriously, my point was that most people don't stop and think for even a second that their battery might be the problem. If you have a 2 year old battery that you've put through the ringer and it you are getting ****ty battery life, you should quit being a cheap ass and buy a new battery. The Epic Touch battery is $18 on Amazon and a 20% increase in capacity. Kind of a no brainer. Unless you're a cheap ass. Or slow. Or you think that wiping a binary file will magically fix it. Or you're a cheap ass.

[Guide] Calibrating battery

I found a guide somewhere on the internet on the best way to calibrate battery stats on a rooted device when I had my old hero and I use it a lot to this day so I decided to share the best way to do it here. If there is in fact a thread about this already in our forums I apologize but I could not find one. So here it is.
Step 1.
First and foremost charge the phone to 100%(Even if it says 100% wait about 5 minutes or so just be sure.)
Step 2.
Once it is at 100% go into data/system (using root explorer) and delete the batterystats.bin file there.
Step 3.
Unplug the charger and reboot to recovery, wipe cache and dalvik cache and wipe battery stats once more while you're there just to make sure they're gone.
Step 4.
Power the phone down and plug it back in. Charge it to 100% while it's off (the battery bar can be deceiving so even once it shows it's full give it five more minutes or so to be sure) and then power up.
*As a side note, if you are using stock kernel, or a kernel without the 100% battery mod then your only going to be at 96%. Thanks to Glennkaonang for reminding me of this.
Once it is booted to the OS you should now see that the battery bar is at 100%. (please note that when it's going through the "Android is upgrading" thing it can take 1 or 2% off the battery if you have lots of apps)
Final step.
Wait for the phone to die completely (to where it shuts off on its own) and let it charge to 100% while the phone is off and power it back up. Do this step at least two or three times.
After that you should have a fully calibrated battery and have no more messed up battery reporting.
Photo of my average battery life just for fun.
Everybody enjoy! If this helped you please hit thanks!
*Thanks to whoever it was that wrote this up in the first place. If I knew who it was I would give proper thanks.
Sent from my Nexus S 4G using xda premium

Unless my batt % reporting goes wonky between reboots, I don't ever wipe stats. It doesn't necessarily increase your battery life, but it does appear to fix incorrect reporting.
Sent from my Nexus S

Wipe batterystats and fix permissions working well after each kernel change but I will give a try.

GideonX said:
Unless my batt % reporting goes wonky between reboots, I don't ever wipe stats. It doesn't necessarily increase your battery life, but it does appear to fix incorrect reporting.
Sent from my Nexus S
Click to expand...
Click to collapse
I didn't think it would improve battery life either but it does. Maybe not a HUGE amount but it definitely does help a little. Plus it will give you the correct percentage rather than showing 100% when it's really only 95%. Lol. Anyways, to each their own.
Sent from my Nexus S 4G using xda premium

It thought someone from Google talked about this before and how it's unnecessary?

doa4ever said:
Wipe batterystats and fix permissions working well after each kernel change but I will give a try.
Click to expand...
Click to collapse
Yeah this is kind of a more in depth way of doing it and it seems to help a bit more.
Sent from my Nexus S 4G using xda premium

Charge it to 100% while it's off (the battery bar can be deceiving so even once it shows it's full give it five more minutes or so to be sure) and then power up.
It's not work on my phone

tuansyaz said:
Charge it to 100% while it's off (the battery bar can be deceiving so even once it shows it's full give it five more minutes or so to be sure) and then power up.
It's not work on my phone
Click to expand...
Click to collapse
Maybe it's not working on your phone because you're using the stock kernel which doesn't have a Battery Life Extender cosmetic MOD.
It's just cosmetic, actually it's still the same 96% as all other Android devices do.
CMIIW

glennkaonang said:
Maybe it's not working on your phone because you're using the stock kernel which doesn't have a Battery Life Extender cosmetic MOD.
It's just cosmetic, actually it's still the same 96% as all other Android devices do.
CMIIW
Click to expand...
Click to collapse
That's pretty much what I was going to say. Lol. I need to add that to the OP.
Sent from my Nexus S 4G using xda premium

This doesn't do anything other than fix incorrect battery logging, it DOES NOT increase battery life in any way.
Not even a tiny bit. Nada. Zip. Zero.
Dianne hackborne covered this on Google+ and said repeatedly that it doesn't extend battery life in the slightest. She would know as she wrote the code I believe.
Placebo effect in operation here. Plain and simple.

Thanks a bunch.

mabry said:
Thanks a bunch.
Click to expand...
Click to collapse
You're very welcome.
Sent from my Nexus S 4G using xda premium

Why do you insist on bumping this? No new information has been uncovered, nothing has changed.
The only reason I can think of is that you are looking to stock up on thanks.

I did this before I even found this thread, save for I use a Battery Calibration app from the market instead of deleting the .bin file. (App does it for me.)
This was the result.
Word.

Great guide! I haven't saw a calibrating guide either. I think it should be sticky!

Joshhayes801 said:
Why do you insist on trolling my stuff? Maybe you should spend your time doing something useful instead of wasting it on something that obviously doesn't matter to you. I bump it so new users can see it. If you don't like it, don't look at it. :thumbup:
Sent from my Nexus S 4G using xda premium
Click to expand...
Click to collapse
I wasn't trying to troll your stuff. I appreciate that somebody created this guide (albeit now proved to be ineffective/useless) as an informative resource for others. That being said, this information is easily found everywhere, especially with search.
Please understand, if everybody bumped a thread they created every few days because they thought it was useful, nothing new would ever show up on the first page of the forum. It would be the same threads appearing over and over.
I wasn't trying to offend you, I just think that bumping dying/dead threads is counter intuitive to growing this forum community.
Thank you.

It is in a sense misinformation though. It doesn't calibrate the battery, merely wipes androids battery usage statistics, which are only for reference to the user not the system.
Although included, the only pseudo calibration is charge fully, discharge fully then charge fully. This process wipes battery stats anyway.

rhanks
Sent from my Nexus S

gear.h34d.2012 said:
I did this before I even found this thread, save for I use a Battery Calibration app from the market instead of deleting the .bin file. (App does it for me.)
This was the result.
Word.
Click to expand...
Click to collapse
I have never calibrated my battery and get almost exactly the same battery life as what you are getting. All this does is wipe the stats.
____________________
Just Flash It !!!

[MICRO GUIDE] Ultimate Battery Drain Fix

I have created this thread so that I can help people with battery drain. I will try to avoid the "too long didn't read" problem by making it as small as possible.
Battery Drain : Battery drain refers to a sudden and unexplained draining of the power from battery sources in an area of paranormal activity.
1)Charge Phone Fully to 100% Using your computer.
2)Restart and Go to CWM Recovery.
3)With the charger still plugged in, wipe battery stats and dalvik cahce (In advanced options)
4)Unplug and Reboot and you may see a slight decrease in the battery. Charge it again to 100%
5)After fully charged, pull out the power then use heavily until 0%
6)Now charge it up again and remove the battery.
(OPTIONAL PART)
7)Put it in a Zip lock bag and then in the freezer.
8)Leave it for 6 hours.
9)Remove the bag and wait for battery to reach room Temp.
10)Put battery in phone.
11)Use the phone like normal and make sure you drain it to 0% before charging in the future.
If this helped, do not forget to hit the thanks.

Nice guide. I hope it helps new users here. :thumbup:
Please give credit where credit is due..
If you can't even search how can I help you??

cascabel said:
Please give credit where credit is due..
If you can't even search how can I help you??
Click to expand...
Click to collapse
Sorry? Is this your signature in the xda app or something. This is my own guide. If you know any similar guides please link them and I will put them in. Also, I never asked a question.

Put it in a Zip lock bag and then in the freezer.
Please man?!!!
A lot of people didn't to that and I didn't to that and I don+t have battery drain. For 1 year I always have 6 days of battery. Heavy use (except playing games) 3 days!
What rom? GZR,IXperia,GCR,... I forgot names of others...!

2010matej said:
Put it in a Zip lock bag and then in the freezer.
Please man?!!!
A lot of people didn't to that and I didn't to that and I don+t have battery drain. For 1 year I always have 6 days of battery. Heavy use (except playing games) 3 days!
What rom? GZR,IXperia,GCR,... I forgot names of others...!
Click to expand...
Click to collapse
Sent you a PM. CHANGED TO OPTIONAL.

Deftone said:
Sorry? Is this your signature in the xda app or something. This is my own guide. If you know any similar guides please link them and I will put them in. Also, I never asked a question.
Click to expand...
Click to collapse
Sorry man. That's my sig in the app.
Please give credit where credit is due..
If you can't even search how can I help you??

2010matej said:
Put it in a Zip lock bag and then in the freezer.
Please man?!!!
A lot of people didn't to that and I didn't to that and I don+t have battery drain. For 1 year I always have 6 days of battery. Heavy use (except playing games) 3 days!
What rom? GZR,IXperia,GCR,... I forgot names of others...!
Click to expand...
Click to collapse
If you get 6 days of battery you have no business replying in a battery drain thread!
You came here to point out something out to the OP which you haven't tried? Why didn't you try? Why did you then point out that his idea should be optional if you hadn't tried it?
How do you know lots of people haven't tried his idea which actually does help?
I've tried it and it does work - get used to the idea that you don't know everything 2010matej..
Again, you get 6 days battery 2010matej - 3 times more than everyone else on XDA so you have no business replying in this thread as your phone has never experienced this issue and you therefore are not qualified to speak on such subjects!

Couldn't have said it better.

Nice. My battery now lasts a but longer. Thanks. Could you put more pictures in this otherwise dull guide. I am not great with reading large ammountz of text.
Sorry if my englis is bad. I am colombian.

or use this app
https://play.google.com/store/apps/details?id=com.nema.batterycalibration&hl=en
it's work identically like this metod. but is faster.

Swapping battery

Hi.
I recently purchased a new battery since the old one is kind of broken.
However it didn't really increase battery life at all. In fact it now shuts down at 35%.
How do I make sure it actually makes use of the whole new battery?

kaboem said:
Hi.
I recently purchased a new battery since the old one is kind of broken.
However it didn't really increase battery life at all. In fact it now shuts down at 35%.
How do I make sure it actually makes use of the whole new battery?
Click to expand...
Click to collapse
bump

bump

Is the battery from Samsung?
Sent from my Nexus 7 using Tapatalk 2

fodustin have
Yes it is.

You must calibrate the battery.
To do it you must be rooted.
Advanced method;
Use a root explorer and go to /data/system. Delete "batterystats.bin" file . Then drain all the battery and charge it while phone is off and unplug the cable whem it says full.. Thats all.
Also there is much easier way to do it if you want. Download battery calibrater app from google play and use it! BUT in any of these methods,you must be rooted.
After doing this it must be normal.Also flashing stock rom and non rooted musn't be problem
Cheers
GT-I9000 cihazımdan Tapatalk 2 ile gönderildi

dreamer94 said:
You must calibrate the battery.
To do it you must be rooted.
Advanced method;
Use a root explorer and go to /data/system. Delete "batterystats.bin" file . Then drain all the battery and charge it while phone is off and unplug the cable whem it says full.. Thats all.
Also there is much easier way to do it if you want. Download battery calibrater app from google play and use it! BUT in any of these methods,you must be rooted.
After doing this it must be normal.Also flashing stock rom and non rooted musn't be problem
Cheers
GT-I9000 cihazımdan Tapatalk 2 ile gönderildi
Click to expand...
Click to collapse
This is not true.
http://www.xda-developers.com/andro...-battery-stats-does-not-improve-battery-life/
This misconception must stop being spread.
Though you're right about the charging bit, op should discharge until it's completely dead, then fully charge it and let it run out, repeat the process.
Sent from horseback.

adytum said:
This is not true.
http://www.xda-developers.com/andro...-battery-stats-does-not-improve-battery-life/
This misconception must stop being spread.
Though you're right about the charging bit, op should discharge until it's completely dead, then fully charge it and let it run out, repeat the process.
Sent from horseback.
Click to expand...
Click to collapse
adytum is right. The phone doesn't need to be rooted. Rooted you can destroy the phones battery statistic file at once but you don't need to. Android permanently learns about your battery (high / low voltage) when charging and discharging.
Have some patience, give your new battery some full charges / discharges and everything should be OK.

I'm going to start working on this then.
Thanks alot !
I was already afraid my whole SGS was broken.
edit: But doesn't draining the battery completely lower its lifetime?

kaboem said:
I'm going to start working on this then.
edit: But doesn't draining the battery completely lower its lifetime?
Click to expand...
Click to collapse
Difficult question - doing big researches will lead to different answers.
The only thing for sure is that completely drained or somehow even completely full batteries will age faster because of electrochemical reactions. Completely drained is worst case, of course.
A common recommendation of the industrie is to store an unused battery charged at about 60-70% and then put it away in some cold storage. That is because even LiIo-batteries suffer self-discharge of about 5-10% per month so it could avoid both stressfull states (0% / 100%) for a long time.
Your phone will never physically drain the battery completely, but will shut down itself before damage is done (don't know if this limit/border could be tweaked, but with StockROMs you should be save). Although it might say 0% there is still some energy left. So it wouldn't hurt to "drain your battery completely" down to 0% a few time if you don't forget to charge it afterwards.
As Android stores the min and max voltage of your battery your really should do complete cycles if you want Android to get your battery statistics right. You even have to do this if you killed Androids battery file on a rooted phone.
Much more damage will be done by keeping the battery at high temperatures, e.g. playing heavy games

I've been doing what has been suggested, however my phone keeps turning off between 30-40%.
Is there any way to solve this?
I'm running Cyanogen ; 10-20121025-nightly-galaxysmtd

kaboem said:
Hi.
I recently purchased a new battery since the old one is kind of broken.
However it didn't really increase battery life at all. In fact it now shuts down at 35%.
How do I make sure it actually makes use of the whole new battery?
Click to expand...
Click to collapse
well u have purchased a junk battery (its rare but sometimes happens, give it back and get ur money back)
i myself use a powercell 1800mAh battery and it pretty much doubled my phones battery life (u could try it)

kaboem said:
I've been doing what has been suggested, however my phone keeps turning off between 30-40%.
Is there any way to solve this?
I'm running Cyanogen ; 10-20121025-nightly-galaxysmtd
Click to expand...
Click to collapse
If you already have a rooted phone and no patience (no experience myself on this matter with ICS or JB), then you could use app "BatteryCalibration" to remove batterystats.bin file as was said in one of the initial postings.

if u use cm10 you can also enter cwm and whipe battery stats, i think under advanced

adytum said:
This is not true.
http://www.xda-developers.com/andro...-battery-stats-does-not-improve-battery-life/
This misconception must stop being spread.
Though you're right about the charging bit, op should discharge until it's completely dead, then fully charge it and let it run out, repeat the process.
Sent from horseback.
Click to expand...
Click to collapse
Seriously guys...
Sent from horseback.

How to Optimize battery drain?

Hello,
I use Tytung's ICS 4.0.4 for my T-Mobile HTC HD2 (NAND), I've been using this ROM for months.
As such there is no problem with functioning of the ROM.
But my battery drains at a very fast rate. With 6hrs of use it drains to 20% at lowest brightness and no major applications running (2 applications in background at most).
Data enabled (2G).
What to do? Please help!!
Sent from my T-Mobile HTC HD2 using XDA Premium.

Can you download CurrentWidget from the Play store and give a value in mA? If you mean 6hrs without any usage then that's pretty poor. Try turning on airplane mode to determine whether it's an app or one of your connections that's causing the problem.
In currentwidget, the values should be approximately 4mA drain in standby with any connections enabled and 2mA in standby in airplane mode. Screen on drain varies a lot more.

OK, thanks. will revert back soon.

With screen OFF, networks ON, 2g enabled....drain is 6mA.
With screen OFF, airplane mode ...drain is 5mA.
Sent from my T-Mobile HTC HD2 using XDA Premium.

That's high but shouldn't be causing a drain of 20% in 6 hours. It's probably just draining a lot when you're using the phone, and there's not much you can do other than turning the brightness down which you've done already.

try wiping battery stats through recovery...fully charge your battery then wipe stats and let your battery to get fully discharge before you connect it to a charger for about a week...My battery never lasted more than a half day before doing this...now it lasts more than a day...Hope this works

Okz.. will try this..hope this works.
Sent from my T-Mobile HTC HD2 using XDA Premium.

eliaskammas said:
try wiping battery stats through recovery...
Click to expand...
Click to collapse
I wonder if this myth will ever die..
Google engineer Dianne Hackberry has talked about several myths about the Android operating system, including wiping battery stats.
The reasoning behind that piece of advice was something like this: If you, at some point, did not charge your Android device fully (for example, only to 80%), it would supposedly remember that battery level as “fully charged” – in this case, you’d only ever get to use 80% of your battery, which is of course less than optimal. So, if you wipe the battery stats, usually done in ClockWord Mod Recovery, the device would “forget” the previous level, here 80%, and instead charge to the full 100% once again, thereby re-calibrating the battery. Or, as Hackborn puts it in more technical terms:
The battery indicator in the status/notification bar is a reflection of the batterystats.bin file in the data/system/ directory.
However, as she explains, that’s not the case. Because those battery stats, stored in the batterystats.bin file, are only used to maintain information about what is using the battery when not recharging. That is, it essentially holds the information displayed in the Settings > Battery screen. Nothing more, nothing less. Thus:
It has no impact on the current battery level shown to you.
It has no impact on your battery life.
What’s more, you’ve probably noticed that the battery usage data is reset once you recharge your device anyway. From this you can correctly deduce that the battery stats are wiped as well – every time your device is recharged. More or less every day. If there was any effect, you would’ve noticed it without going into recovery and doing that stuff. Typical placebo, eh?
---
I’m as confused as a baby in a topless bar...

^Whenever someone asks 'how do I reduce my battery drain', ten people immediately jump in with 'CALIBRATE!!11oneeleven!'. No hate directed at whoever posted that advice here, I understand how easy it is to be misinformed (as I was about using SetCPU ), I just think that rumours like this are too easily presented as facts.

NYLimited said:
I wonder if this myth will ever die..
Google engineer Dianne Hackberry has talked about several myths about the Android operating system, including wiping battery stats.
The reasoning behind that piece of advice was something like this: If you, at some point, did not charge your Android device fully (for example, only to 80%), it would supposedly remember that battery level as “fully charged” – in this case, you’d only ever get to use 80% of your battery, which is of course less than optimal. So, if you wipe the battery stats, usually done in ClockWord Mod Recovery, the device would “forget” the previous level, here 80%, and instead charge to the full 100% once again, thereby re-calibrating the battery. Or, as Hackborn puts it in more technical terms:
The battery indicator in the status/notification bar is a reflection of the batterystats.bin file in the data/system/ directory.
However, as she explains, that’s not the case. Because those battery stats, stored in the batterystats.bin file, are only used to maintain information about what is using the battery when not recharging. That is, it essentially holds the information displayed in the Settings > Battery screen. Nothing more, nothing less. Thus:
It has no impact on the current battery level shown to you.
It has no impact on your battery life.
What’s more, you’ve probably noticed that the battery usage data is reset once you recharge your device anyway. From this you can correctly deduce that the battery stats are wiped as well – every time your device is recharged. More or less every day. If there was any effect, you would’ve noticed it without going into recovery and doing that stuff. Typical placebo, eh?
---
I’m as confused as a baby in a topless bar...
Click to expand...
Click to collapse
LOL i was just gonna post but ya beat me to it
i will just add the link to the xda news post about it
http://www.xda-developers.com/andro...-battery-stats-does-not-improve-battery-life/

Nigeldg said:
^Whenever someone asks 'how do I reduce my battery drain', ten people immediately jump in with 'CALIBRATE!!11oneeleven!'. No hate directed at whoever posted that advice here, I understand how easy it is to be misinformed (as I was about using SetCPU ), I just think that rumours like this are too easily presented as facts.
Click to expand...
Click to collapse
And I shall not tell you how many times I did erase that bloody file before I too learned the truth. :crying:
Kameirus said:
LOL i was just gonna post but ya beat me to it
i will just add the link to the xda news post about it
http://www.xda-developers.com/andro...-battery-stats-does-not-improve-battery-life/
Click to expand...
Click to collapse
Want me to go back and erase it for ya? No biggie...

Lol...
When one doesn't know a thing, he can be easily fooled about it.
Anyways ...Learnt something new today... :thumbup:
Thank you everyone.
Sent from my T-Mobile HTC HD2 using XDA Premium.

NYLimited said:
Want me to go back and erase it for ya? No biggie...
Click to expand...
Click to collapse
LMAO no

sonalikagaur said:
When one doesn't know a thing, he can be easily fooled about it.
Click to expand...
Click to collapse
As I said to Nigeldg in an earlier post:
NYLimited said:
And I shall not tell you how many times I did erase that bloody file before I too learned the truth. :crying:
Click to expand...
Click to collapse
sonalikagaur said:
Anyways ...Learnt something new today... :thumbup:
Click to expand...
Click to collapse
And that is all that's important.

to sonalikagaur....
obviously as the guys say don't bother trying my advice
to everyone...
at least now I know not to tell anyone about battery stats again...but now there is a wonder in my head...what made my battery last longer than it did before? I wasn't kidding that it lasts half a day longer than before...obviously battery stats didn't make the job...what did.? :-/

eliaskammas said:
to sonalikagaur....
obviously as the guys say don't bother trying my advice
to everyone...
at least now I know not to tell anyone about battery stats again...but now there is a wonder in my head...what made my battery last longer than it did before? I wasn't kidding that it lasts half a day longer than before...obviously battery stats didn't make the job...what did.? :-/
Click to expand...
Click to collapse
I found out something.... usually I used to keep my 2G ON the whole day...but when I switched my data OFF when not in use...my 6hrs...20% battery remaining changed to 8hrs..n 75% remaining.
That's a huge difference.
Can anyone suggest a good app for this? Switching my data OFF automatically when not in use .!!
Sent from my T-Mobile HTC HD2 using XDA Premium.

I think Juice Defender has this functionality built in.

sonalikagaur said:
I found out something.... usually I used to keep my 2G ON the whole day...but when I switched my data OFF when not in use...my 6hrs...20% battery remaining changed to 8hrs..n 75% remaining.
That's a huge difference.
Can anyone suggest a good app for this? Switching my data OFF automatically when not in use .!!
Click to expand...
Click to collapse
I would guess that many so called "battery saver" apps might have it, not really sure.
I don't turn off data when not in use automatically but I do use Tasker to turn it off for several hours while I sleep.

NYLimited said:
I would guess that many so called "battery saver" apps might have it, not really sure.
I don't turn off data when not in use automatically but I do use Tasker to turn it off for several hours while I sleep.
Click to expand...
Click to collapse
Yeah Tasker can do this but it's a paid app. Juice Defender is free and can also do the same thing in this case. I agree that Tasker is awesome but not necessarily for saving battery, more for ease of use.

Nigeldg said:
^Whenever someone asks 'how do I reduce my battery drain', ten people immediately jump in with 'CALIBRATE!!11oneeleven!'. No hate directed at whoever posted that advice here, I understand how easy it is to be misinformed (as I was about using SetCPU ), I just think that rumours like this are too easily presented as facts.
Click to expand...
Click to collapse
Could your go into more detail about you're previous misinformation about SetCPU?
Sent from my ZeJstersHD2 using xda premium