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For android 8+ after update V18 you may need to manually adjust the notifications after updating:

1. Go to settings
2. Go to Apps
3. Find Battery (App) and click on it
4. Find Notification (Allowed) and click on it

set in Categories:
Battery --Silent
HighImportance -- Sound and pop-up (this is Notification warning) - here you can change notification Sound
LowImportance -- Silent
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The application is free and ad-free (There is no profit) so please
contact me at e Mail:
[email protected]
for any problems before giving a bad rating.

Thanks a lot for every 5 star Rating :-)

This application does not ask for any permissions or rooting of the phone.
You can use a combination Voice Warning or Sound Warning with Notification Warning.
Continuous Alarm - allows for a higher frequency of alarm recurrence.
Battery remain - not all phones are supported
Minimum alarm cannot be greater than maximum (logical)

This is the simplest battery control program (battery monitor) low battery alarm high battery alarm.
Set the alarm for maximum charge and the minimum battery alarm (prevents your mobile phone battery from being overcharged and discharged).

Free Battery Alarm without any ads :)

Thanks!