Battery Pro (Assistant) is Lightweight and lowest consumption usage. This app use for battery monitoring. Also this app have special features. When your Smartphone is fully charged or unplugged, the app will notify you with simple Beep tone.

Battery Pro (assistant) Monitoring List:

Charging status.
Voltage status.
Current power status.
Health status.
Level status.
Charging time left status.
Capacity remain status.

Battery Pro (assistant) special features:

Alarm on battery full.
Alarm on charger unplugged.