May be...that's not working guy,my battery still drains on reboot. I'll try to flash back to stock and see if this happens. so it's problem with my battery.
See, i had two problems with my battery. 1) Battery drop after reboot and 2) after reaching 20% it drops 1% every half minute and reaches 0% within 10 min.
I solved the first problem by going to stock MiUi and calibrating the battery. But second problem still persists...
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