Absolute nightmare. Not just leaking batteries but several components had to be replaced on the front. Ridiculous amounts of contact cleaner in the card slot. Copper plate ground so corroded I could peel it off like wet toilet paper. Removed it and soldered all the contacts together. Bought for 5 bucks, only took about an hour to fix.
Wowza! So you ended up just bussing all the points that used to touch the ground plane together with wires?
Game Boy be bussin’