Use APKPure App
Get Battery Saver 2015 old version APK for Android
Enjoy this simple and powerful app.
It will increase your battery life up to 30%!
The pro version (you can buy it inside the app) will save more (up to 40%) energy!
You can try it to understand if it works as we stated.
No settings, no configuration needed.
Just tap On or Off inside the app!
It will take care automatically of everything.
If you plan to download something just disable Fuel Saver or use WiFi.