DU Battery Saver is an app which is available on play store for android phone.This app is used by me to save my Battery as much as possible.
80 to 90% of batterry is consumed when the phone is Idle i.e The phone screen is on.DU battery Saver has No Feature to counter this problem leaving Decreasing the brightness level, disabling wifi or bluetooth, switching the network to airplane modes, etc.
The app is said to do RAM Optimization but for my phone it does’nt hold through out of 1.5 GB RAM size only around 25 MB RAM is Optimized.Better use Power Banks For charging and never have concern to save battery forever.!*