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I just found this App (Battery Repair) on the Google Play Store, my question is how can it make my battery last longer. What optimazions are they doing? Has anyone tested this tool, does it work?

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reading the reviews it reminds me of a scam application in which shaking the handset to charge up the battery and resulted in a lot of troll reviews... just saying, if it sounds too good to be true... beware... :) –  t0mm13b Sep 12 '12 at 19:40
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@t0mm13b believe it or not, on AndroidPIT we had a whole thread on that shake-charger as one asked how that worked -- and only when someone insisted his phone replaced an atomics reactor (but he now had a tennis arm) the guy who asked got it's a fake... So I basically think the same (too good to be true), though the comments here sound more reasonable then the one I just mentioned. I see no way how it could work. Still curious if someone can convince me otherwise. –  Izzy Sep 21 '12 at 6:52
    
I believe that even there is an app like Battery Repair, it will never repair your battery. I agree with erik that an app can only recalibrate a battery, not repair. I guess it's only a way to increase the volume traffic for that particular app. –  user20672 Sep 26 '12 at 6:17
    
You think another third party application can do better power management than Android? –  user Nov 19 '13 at 15:51
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up vote 8 down vote accepted

No app can "optimize" or "maintain" the battery in any way as it can't get the necessary access to the hardware -- probably not even if it required root. This app explicitly advertises that it does not. Anyway, the manufacturer's engineers surely have already implemented all the necessary optimizations. There is no way that the app's developers knows anything useful about every phone's charging circuitry and battery that the engineers don't.

In short, there is no way this app does anything useful at all. (It might even be malware, but I don't get that impression in this case).

(Note: the following is probably not true)

The only thing an app can do (on a rooted phone) is to recalibrate the battery. If the battery is miscalibrated the OS might think that it is as good as empty and force a shutdown although there is still a useful amount of charge left. One app that does this is the aptly named Battery Calibration.

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Though that calibration stuff is called a myth in many places (as the battery stats file should only contain statistics on how much battery was used by which app), that's the only explanation making halfway sense. Still I'm not sure whether to believe it or not, also due to the "myth" part. –  Izzy Sep 21 '12 at 6:54
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