Software →Bluetooth Battery Monitor 2.22.0.1

Wide range of device support
Bluetooth headphones, keyboards, mice, digitizer pens, game controllers ... If your device reports its battery level, Bluetooth Battery Monitor can show it. †
Starting version 1.9.0, selected non-Bluetooth input devices are also supported.
Accurate battery level reading
Unlike some other applications that show "guestimate" battery level, Bluetooth Battery Monitor shows real data which was measured by each Bluetooth device. This usually gives you more accurate information.
Check all devices with a glance
Bluetooth Battery Monitor displays all devices' information in one compact dialog box. You don't need to check each device one by one.
Alert when your device needs charging
Bluetooth Battery Monitor will call your attention with notification message know when one of your devices needs charging.
Don't worry if you missed the notification message. System tray icon shows you the level of the lowest battery of all your Bluetooth devices by its color.
Operating System:Windows 10 Version 1607 (Build 14393) or newer (64-bit only)
Home Page-

https://www.bluetoothgoodies.com/