istemamahmed :
1 days ago I have bought a new mobile ohone battery of 2000mha power. I charge it 11 hours. But it drains extremely fast. It got 6 month replacement garranty. It drain 50% in 1 hours.
If you would, download two tools and follow their instructions:
1. For monitoring, please download GSAM Battery Monitor and ensure it's started on your phone as you go about a normal day.
2. Find a decent-looking "Battery Calibrator" from the market. Follow its instructions. Something like this may do well:
https://play.google.com/store/apps/details?id=com.newagetools.batcalibra
I'll be frank: I doubt it's software. But, software is cheaper, so try seeing if that works first. The first tool will help you figure out if it's something in the OS...