I added a USB-C connector and a bigger battery to my Logitech MX Master mouse : r/electronics
USB Charger Charging Cable Cord Wire Compatible for Logitech MX Master 2S/ MX Anywhere 2/MK875/MX Ergo/MX Ergo Plus/Performance MX/ G502/ K800/G915 TKL & More USB Mirco Port Mouse/Keyboard
Logitech Replacement USB Charging Cable for MX Master/MX Master 2S Mouse | eBay
4ft USB Charging Cable for Logitech MX Master Mouse/MX Anywhere 2 Wire – Magconn