Battery Drain With Stable Rom V9.5.1.0.

Apr 9, 2016
Hello my friends
I sold my Xiaomi MI3 and my MI4. Both devices were flashed with the stable rom ( It was a clean install,
Both devices were cleanly installed, the cache and also the data partition were formatted.

Unfortunately, this Rom draws the battery empty on both devices. A battery charge lasts only about 6-8 hours. The devices were not used ...
The Google app, Android system and Whatsapp each consume 17% battery. The energy-saving mode is also switched on.
What can help?