liwen · Jan 14, 2012 at 07:38 am

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?


_________
Want something on the XDA Portal? Send us a tip!

liwen

liwen is an editor on XDA-Developers, the largest community for Android users. View liwen's posts and articles here.
Jimmy McGee · Jul 29, 2015 at 06:00 am · no comments

ZenFone 2 Lolliflash and ZenPower Giveaway!

We recently did an in-depth review of the Asus Zenfone 2 but one of the things people may not be aware of is that ASUS has actually created a line of accessories to compliment the ZenFone, or any other Android device. The Lolliflash is a Lollipop-shaped external flash and the ZenPower is a thin 10,000mAh external battery. In today's video, Jordan shows off the Lolliflash and the ZenPower Accessories. Additionally, ASUS and XDA have teamed up to give away 5...

XDA NEWS
Mario Tomás Serrafero · Jul 28, 2015 at 04:20 pm · 1 comment

OnePlus 2 Forums: Discuss Everything About The OP2!

Now that the OnePlus 2 has been officially unveiled and that we have had close-up looks at the device itself, it is time for XDA users to begin discussing what to expect out of the company's new flagship phone. Can the OnePlus 2 help you never settle? If you want to find out by discussing with fellow users, the XDA forums are the right place to do so.   The OnePlus One is known for its great community which helped...

XDA NEWS
Aamir Siddiqui · Jul 28, 2015 at 12:56 pm · 2 comments

Galaxy Unpacked: What is Samsung Going to Unveil?

Amidst all the hype of the OnePlus 2 and the rain of Moto 2015 news, Samsung tried stealing the limelight back to itself by announcing their next "Galaxy Unpacked" event, which will be held on August 13th 2015. Samsung took to Twitter to reveal a very cryptic gif associated with the event, which probably has some clue on the device(s) to be launched. The hashtag "#TheNextGalaxy" does indeed point that the event will be the launchpad for a Galaxy device,...

XDA NEWS