Battery Alarm allows users to create their custom notifications for their device's battery status. Users can create, edit and delete alarms by choosing the battery level(%) and charging status.
They can also select the way they want to be notified each time (notification sound, volume and vibration). Each alarm can be activated/deactivated.
Whenever the battery meets the condition (level and charging status) of an active alarm, the user will receive a notification.
https://nullbuilt.github.io/Battery-Alarm/