This app _tries_ to show battery level of the bluetooth devices. Bluetooth device MUST has Hands-Free profile (accept, reject phone calls) or GATT profile (usually 4.0+ Low Energy devices).
To recheck battery level just tap on the notification.

From version BatON 1.2.69:

Added some accessibility functions
Fixed show notification by battery level condition

All versions
BatON 1.2.69
September 21, 2019

Version:1.2.69

Uploaded:September 21, 2019 at 10:50PM UTC

File size:2.36 MB

Downloads:1,627

BatON 1.2.68
September 11, 2019

Version:1.2.68

Uploaded:September 11, 2019 at 1:16AM UTC

File size:2.36 MB

Downloads:136

BatON 1.2.67
August 18, 2019

Version:1.2.67

Uploaded:August 18, 2019 at 4:22PM UTC

File size:2.36 MB

Downloads:183

BatON 1.2.66
July 24, 2019

Version:1.2.66

Uploaded:July 24, 2019 at 7:47PM UTC

File size:2.36 MB

Downloads:217

BatON 1.2.65
July 23, 2019

Version:1.2.65

Uploaded:July 23, 2019 at 9:22PM UTC

File size:2.36 MB

Downloads:94

BatON 1.2.64
July 22, 2019

Version:1.2.64

Uploaded:July 22, 2019 at 8:15PM UTC

File size:2.36 MB

Downloads:80

BatON 1.2.63
July 12, 2019

Version:1.2.63

Uploaded:July 12, 2019 at 6:30PM UTC

File size:2.36 MB

Downloads:111

BatON 1.2.62
July 12, 2019

Version:1.2.62

Uploaded:July 12, 2019 at 9:33AM UTC

File size:2.45 MB

Downloads:93

BatON 1.2.61
July 11, 2019

Version:1.2.61

Uploaded:July 11, 2019 at 3:49PM UTC

File size:2.45 MB

Downloads:67

BatON 1.2.60
May 24, 2018

Version:1.2.60

Uploaded:May 24, 2018 at 5:08PM UTC

File size:2.45 MB

Downloads:4,619