I have 3 G602 Mice. They all are facing the same problem and are unusable now. : r/LogitechG
Logitech International - Logitech G Delivers Unprecedented Battery Life with New G602 Wireless Gaming Mouse
G602 Battery Levels Always reading 2 bars. This makes it a pain to tell how long until I need to change them as I don't get a low battery notification, the mouse
Best Wireless Gaming Mouse for not gamers - WOVOW
Logitech's latest wireless gaming mouse runs for 125 hours on a single AA battery - The Verge