A battery percentage these days is very important not quite but important. We need to know how much battery life left so we can plan around it.You know with smartphone batteries being generally poooooor. But Google is working on adding a battery percentage feature to Android 4.4 devices, but it doesn't complete yet. SO HERE SOME SIMPLE APPS FOR BATTERY NOTIFIER------ Battery Notifier BT Free:- This app is one of the simple available with a battery level indicator in the status bar, it take very less memory and puts the least possible strain on your battery. It has also battery full and low alarm notification features.