Is there many wireless gaming mechanical keyboards DIY batter replace.

I used some corsair and saw allot keyboards and mouse that use wireless as you charge by usb but it haves internal battery over time dies but there no instrustion or people doing diy to replace old battery to reuse a 200 gaming keyboard and mouse.

I wanna buy wireless gaming keyboards 2018 or 2019 as rbg red blow brown like corsair,logic,cooler master as I am not sure have any one found DIY how to replace this internal batterys and not rebuy each times it dies.