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Posted 06 May 2012 - 00:06
Posted 06 May 2012 - 07:11
It's an urban myth that's somehow managed to gain popularity. The actual battery sensor data is stored within (or in a component near) the battery, deleting a file in the OS has no effect on how charged the battery reports it is to the phone.
The best way to actually recalibrate your battery is as follows:
You should notice your battery stays at the top end of charge a lot longer and it may get marginally better as you go through a few charge/discharge cycles.
- Kill it dead.
- I mean stone dead.
- Wait till the Android OS won't power it anymore, then boot it into the bootloader.
- Leave it in the bootloader until THAT dies.
- When the phone can no longer be turned on at all, the battery sensor should be reset since there's (technically) nothing left to power it.
- Charge it while it's turned off, preferably overnight.
- As much as you want to, don't turn it on.
- Seriously. Leave it alone. You'll thank me later.
WARNING: This method is not for every time, you CAN reduce your overall battery lifetime by repeatedly doing this, Li-ion cells react best when kept partially charged and recharged regularly, this is only to reset the sensor in the battery itself which you shouldn't need to do that often.
EDIT: Sources - I've done it several times over the course of the 2 years I had my Nexus One and at the end it could still manage nearly 2 days without having to replace the battery.
After a few charge cycles with my Galaxy Nexus where I was getting 12-16 hours (as it comes partially charged) I did it on this one and my fiancee's too and we're now both happily getting 2 days out of the GNex with moderate usage, something I've heard a lot of people struggle with.
There's also some good information on it here, though it's not in the context of mobile phone batteries.
I did find something interesting while looking for that link, the sensor that holds the charge data may NOT be in the battery itself but may instead be part of the phone but it's still not affected by anything the OS interacts with, it just passes on the data it's received from the battery. Draining the battery completely will still reset the information regardless.
DOUBLE EDIT: Don't do this often. Once should be enough, then you can go back to your regular partial discharge / charge cycles.
Posted 06 May 2012 - 07:19