I found a program for windows 7-10 that displays your bluetooth devices battery percentage! : r/Windows10
Logitech M310 Wireless Mouse with Ambidextrous Design
Logitech M535 Bluetooth Mouse Compact Wireless Mouse with 10 Month Battery Life Works with Any Bluetooth Enabled Computer, Laptop or Tablet Running Windows, Mac OS, Chrome or Android (910-004432)
Check Mouse And Keyboard Battery Level In Windows 10
Logitech MK710 Desktop Wireless Mouse and Keyboard Combo
How to check Bluetooth battery level on Windows 10 - Pureinfotech
MX Master 3 Battery indicator : r/LogitechG
Amazon.com: Logitech M170 Wireless Mouse for PC, Mac, Laptop, 2.4 GHz with USB Mini Receiver, Optical Tracking, 12-Months Battery Life, Ambidextrous - Blue : Electronics
Logitech M170 Wireless Compact Optical Ambidextrous Mouse Black 910-004940 - Best Buy
Logitech MK710 Full-size Wireless Keyboard and Mouse Bundle for Windows with 3-Year Battery Life Black 920-002416 - Best Buy