Amazon.com: JKPOWER Replacement Battery Case Cover Mouse Case Shell for logitech G700 G700S Mouse Replacement Mouse Battery Cover Battery Case Black : Electronics
G305 battery cover version 2: gap in the front fixed, increased thickness to stock for aesthetics, added 14 more holes. Sould be around 4g : r/MouseReview
Replacement Mouse Battery Case Cover Mouse Case Shell for logitech Mouse M275 M280 M330 M331 Mouse Accessories|Mice & Keyboards Accessories| - AliExpress
Amazon.com: JKPOWER Replacement Battery Case Cover Mouse Case Shell for logitech G700 G700S Mouse Replacement Mouse Battery Cover Battery Case Black : Electronics