Save the battery power of your smartphone dramatically
After I returned to the factory settings of my Redmi Note phone, I realized that battery power was consumed much faster than before!
I updated the system and all apps and I turned on Battery Saver. Things became better but not as before.
Then I turned off GPS, HotSpot, Rotation and WiFi, even restricted background processing to most of my apps. Then I turned off also Bluetooth and this final step increased battery saving dramatically.
Perhaps you’d have the same result if you had Bluetooth off and WiFi on. In any case it seems that connection sensors such as WiFi and Bluetooth are power hungry, do not activate them when you don’t need them!