I started buying (and modding a bit) some Gameboy consoles this month. Added rechargeable batteries (and charging boards) to the 2 DMG’s and re-shelled the GBA SP. During the battery modification on the Yellow one, I also blew out the amplifier, so that needed to be fixed. After all that, I increased the brightness on the SP by soldering in a 16ohm resistor. I might replace the whole screen with a backlit one later on.
I’m not sure yet if I’ll keep the Gameboy Pocket, It doesn’t really fill in a good position between the other models. It’s a good candidate for an LCD screen swap as well, but it may be a bit too small and cheap feeling of a device for me. We’ll see.