First off, watch the install instructions. Its an easy mod, but watching the retro six video is needed for proper fitment. My kit also did not come with any double sided tape, i have some of my own but i feel like this bit is also an important step not to be skipped. I did have to bend out the battery cover latch slightly to get the proper amount of pressure to keep it closed. Not sure if that was an issue with the IPS ready shell i bought or not though Lastly, it does seem to get quite warm when charging which im not a fan of, but normal gameplay doesnt heat anything up. All in all its a lovely upgrade for anyone not interested in dealing with batteries, definitely happy with my purchase.

I bought this for a christmas present last year. It took a while to get all the parts and build it into a shell. I choose a retro six shell, and the battery cover doesn't even stay on. I thought it was designed for this? But that aside, we used it off and on until the battery died. I figured out how to position everything on a wireless charger and the lights lit up. But no longer how long it would stay on the charger, the game boy would last 5 minutes before turning off. I eventually removed the battery and put it and the charging coil directly on the wireless charger. Same deal. Slight odd smell after it's been on there. I'm going to assume things aren't working as it should. I've ripped everything out and am using AA batteries for now. Will be leary of RetroSix products going forward.

i followed the retrosix guide on youtube for instillation, and the pcb got incredibly hot.
go with some other mod

I don't like the way that contact to the battery is made, I don't like that way the board makes contact to the battery terminals, and also don't like that it's wireless charging only. I wish that it was something more similar to the cleanjuice AGB-001 battery option with the USB-C charging and the battery that hooks to the board with a connector. It works as advertised, but after buying and installing I prefer other options better.

First, the board this battery comes with is annoying to work with. The contacts on the board are a nightmare to line up properly. Using it is also a chore because it'll only work when you prop up the top of your GBC so the charging coil is perfectly parallel to the charging pad.
Probably more importantly is that this board gets unusually hot compared to every single wireless charger I've ever tested. If you have any idea how a lithium battery works, you should immediately be worried about this. For your own safety, do not get this item.

it doesnt charge when put on a wireless charger and the battery cover wont close. look for something else, dont waste your money.