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Wiping Battery stats and Battery Calibration Myth gets Debunked

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By Kameirus, Senior Member on 28th February 2013, 01:32 PM
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this was posted on the XDA Portal on JANUARY 14, 2012 AT 7:38 AM BY Liwen..

and i thought i would repost it as it seems lately alot of people are being misinformed about it

Google Engineer Debunks Myth: Wiping Battery Stats Does Not Improve Battery Life...

There you have it, in the title. Google engineer Dianne Hackborn, who has previously explained Android’s hardware acceleration, took to Google+ again to clarify some myths about the Android operating system. This time, it’s a point of common advice that you’ll see in virtually every FAQ thread about custom ROMs and flashing: wiping battery stats in order to improve battery life.

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?

link to XDA Portal post
http://www.xda-developers.com/androi...-battery-life/

maybe a mod will sticky this as i think it needs to be at the top of the page so people can see it .......
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7th March 2013, 03:45 PM |#2  
Robbie P's Avatar
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Hackborn, excellent name. Sounds like my kinda girl

Edit; Found another interesting article by her about android multitasking http://android-developers.blogspot.c...droid-way.html
(With a pic)
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7th March 2013, 07:17 PM |#3  
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Quote:
Originally Posted by Robbie P

Hackborn, excellent name. Sounds like my kinda girl

Edit; Found another interesting article by her about android multitasking http://android-developers.blogspot.c...droid-way.html
(With a pic)

nice find Robbie

hey im gonna pm you about a couple apps you might like
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19th April 2013, 03:57 PM |#4  
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Thank you so much! Even I do not own HTC Leo: HD2 this is still important for us Galaxy Y owners , Can I put this on our Forums and linking a thread here so they know who to thank? and a credits to you also as well . Thanks button pressed.
19th April 2013, 04:19 PM |#5  
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Quote:
Originally Posted by Sean De Jesus

Thank you so much! Even I do not own HTC Leo: HD2 this is still important for us Galaxy Y owners , Can I put this on our Forums and linking a thread here so they know who to thank? and a credits to you also as well . Thanks button pressed.

your welcome
yes you can add to to your forum section
no credits to me are needed i just posted it from the xda news page
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11th August 2013, 05:36 PM |#6  
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my htc hd2 wired problem .. my battery drains very fast.. . if i connect power cable after some time phone boots... some times while charging itself my phone switched off.. screen dark.. only liberates no display...


is it problem with my battery..or phone hardware issue...

me changed different rom.. and sd card. two years worked very well .. without any issues.. no Im in big trouble..with this phone

help me
12th August 2013, 06:21 AM |#7  
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The phone's supposed to turn on while charging when off in MAGLDR, that's completely normal. The high drain could be caused by any number of things and since there are various guides around as to how to reduce your battery drain I'm not going to get into it right now. The other issue you have is (I assume, the wording's a bit difficult to understand) an SOD or 'sleep of death'. Try flashing a newer ROM because afaik this issue doesn't exist on modern HD2 ROMs at all.
10th June 2014, 02:11 AM |#8  
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cool, good to know.
27th July 2014, 09:52 PM |#9  
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this is the question about li-ion battary. Smn says that better to charge from 0 to 100. and use from 100 to 0, but theoretically, this kind of battery better be used from 20 for 80 percent. So, there is a lot of things to debate.
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