Game Boy Advance USB-C Battery Cover for CleanJuice GBA
It's exactly what I wanted/needed to finish my endeavor to make my perfect custom gameboy.
I doet have thuis order yet because i was too late.
Especially with after-market backlights, the GBA has always suffered from pretty poor battery life. This is a great way to get modern rechargability and a longer lifespan when you just absolutely have to beat that boss!