Answer Happy

The functional requirements of an android battery checker
application are
1) The app should show the current accurate level of the battery
charge.

2) The app should able to monitor/ Understand whether the battery
is plugged in to charger or not (ie: means charging happening or
not)
3) Application should need to trigger warning alarms and
messages when battery level is very low.
4) Application should able to show warning signs when battery is
overcharged (beyond 100% charging)
5) The battery level indicator (percentage / bar etc.) should
need to show exact value.
6) The application should able to monitor the abnormal charging
loss and to report it.
draw a use case diagram of this android battery checker
application
The main elements in the diagram are:
1. the actors, represented by stick
figures;
2. the use cases, represented by ovals;
3. the relationships/associations between actors and use
cases – represented by lines.
don't forget the stereotypes «include» and «extend» in
your use case diagram.