Highly efficient. Notifies you when your phone is fully charged. Free version.
The app is designed to alert you when your device reaches the desired battery level.
Important: for the app to work, it must be open or running in the background. If you close the app completely (e.g., swipe it away), it will stop working.
How to start the app:
Open the app, set your target charge (default is 100%), tap the "Start" button — then you can turn off the screen or simply minimize the app.
When the target charge is reached, the phone will play the selected ringtone.
To stop the alert, open the app and tap the "Stop" button.
If the app is active, a notification will appear on the lock screen: “Waiting for target charge.”
Permissions:
The app requires two permissions to work: "Alarms" and "Notifications."
It will request these permissions when you tap the "Start" button, if they haven’t been granted yet.
You should also disable the option “Remove app permissions if unused.”
(To make sure the app isn’t automatically stopped.)
Settings → Apps → batty → “Remove app permissions if unused.”
Alert timing and ringtone selection:
The alert is triggered within 1 to 30 seconds, depending on the background processes of your device.
To change the ringtone, open the "Ringtone" window and select the one you prefer.
The app works on Android 6.0–13.0 (API 23–33).
I hope this app will be useful to you. Have a great day! 😊