Step 1 : Download and Install Battery Notifier BT Free Mobile app in your android phone.
Step 2: Go to Setting
Step 3: Select "Low Battery Charge Option"
Step 4: Then select Low Battery Level as your choice when you want to be get notified, Select Repeat Interval, How often it would repeat alarm, Select Vibration, Sound Mode and Notification Ringtone.
Step 5: When your Device will reach to the minimum battery level, it will ring your phone and you will be get notified that your phone's battery is low and you need to charge that.