Please HELP - Drain issue in phone calls mi4c. Please HELP. I have a issue and I flash cm12, cm13 and lots of xiaomi.eu stable and weekly roms and the issue allways appears. This issue appear in a mi4c of a friend that i have and in my personal mi4c. The issue is simple, my battery drains the double in phone calls in 2G/3G/4G with screen off then normally using it in browsing, i explain, if i make 1 hour of phone calls it drains 20%, if i use it in normally use in one hour it drains 10%. See screenshots attached, and please HELP. THANKS. P.S.: I use it with a dual sim card. I search for this answer a long time ago and i don't know how to fix this issue.