Rainbow Battery Bar has the following features

- Always visible battery bar at top of the screen. The battery bar reflects with its color the actual battery level
- LED notification while charging. The LED color reflects the current battery level. (Only for models supporting RGB LED colors)
- Sound notification if battery empty or full
- Extra information in the notification bar

No ads. Highly customizable.

Permissions explained
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Photos/Media/Files
--Read the contents of your USB storage --- needed to use external (your own) ringtones

Storage
--Read the contents of your USB storage --- needed to use external (your own) ringtones (same as above)

Other
--Run at startup --- if you want to run the app automatically whenever you turn your phone or tablet on
--Draw over other apps --- to show the battery bar