When the iPhone is fully charged, the alarm rings!

There is an app for full charge time alerts.

Usage is very simple.
1. To check the battery capacity and charge voltage / current, 1 ~ 2% charge is maintained at the state of running the app (screen on).
2. When the time count starts automatically, you can turn off the screen or close the app.
3. Automatically notify when the estimated full charge time is reached.