Tu jest opisany proces kalibracji baterii, przed chwilą go zrobiłem na romie Android Revolution HD 6.1.2 i się zobaczy czy coś to dało. Sory że po angielsku ale nie ma dużo tego tekstu.
--Let the phone in charge, untill you see 0mA on current widget (or elixir)--
--Now open Battery Calibration--
--Chose remove battery_stats.bin---
--Click on "exit application"--(no reboot your phone from the app option!!)
--Reboot your phone COMPLETELY--(no hot restart!! Just reboot)
NOTE: keep the phone plugged during all of these steps
What's happening now?!
Now you have deleted a FS files. It means that Android will create the files again when you are booting your phone! But now, the files is being created properly, because you have charged your battery at his maximum capacity, and this means that the files.bin will show to android the correct, full capacity, of your battery!
Źródło: [How to] Brilliant Battery Life 100% working! - xda-developers
... i więcej na temat sposobów oszczędzania baterii w naszym Desire HD w tym temacie.