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!
Emil Kako · Feb 28, 2015 at 10:15 am · 1 comment

Which App Is Most Desperately in Need of an Update?

While the majority of the top apps have already incorporated Google's newest design language, there are still very many apps that are in need of some Material Design love. Which apps do you think are most desperately in need of an update?

DISCUSS
Mario Tomás Serrafero · Feb 27, 2015 at 03:52 pm · 1 comment

PhotoMath: A Math Beginner’s Dream App

To me, applications like this one are really important for school students. I bought my first significant Android the same year I began my Physics degree at my university, and immediately I realised how tremendously helpful it was. From accurate graphing applications to TI emulators (don't judge me, the real thing costs crazy amounts here!), passing through giants like Wolfram and MATLAB Mobile, there were a lot of tools for one to excel with. In fact, I'd say that without Android I wouldn't have chosen...

XDA NEWS
Mario Tomás Serrafero · Feb 27, 2015 at 12:47 pm · 2 comments

Leaked Galaxy S6 Apps Hit the Forums

XDA Recognized Contributor Albe95 has shared with us what looks to be Galaxy S6 applications. The ones he's provided are the GearManager, the Optical Reader, GeoNews and Kids Mode. The applications are available for download through the links in the opening post, but keep in mind it is likely that they might not be compatible with your device. There's also new information about more applications and system interface features revealed in the same thread:     The alleged S6 statusbar and panel are ported to the...

XDA NEWS
Share This