Application plays sound when battery goes low or fully charged.
Application has "Advises" section how to take good care about your battery.
Application shows far more advanced data about battery that any other does. Example:
First added widget will show you your battery level right away. Any additionaly widgets added will have n\a for first period of time(up to 30 minutes), after that it will show you all information needed.
Usually app is detecting battery capacity on its own, but in case you are using non stock battery or you suspect that capacity that app detected is incorrect please shot me email with device model number and your battery capacity. I will add/correct this in next update.
for tabs and phones 2.1+