i have a very old gameboy advance sp that’s been passed around the family for several years. after leaving it charging for several months we found the battery expanded to nearly twice it’s size. good thing we caught it so we could unplug the console and remove the battery. the battery case flew right off! we took off the bottom casing to check for any damage or warping, and so far everything looks okay. just the battery case is a little bent.
i’m wondering where i can find a good battery replacement. i know lithium ion batteries are notorious for expanding when overcharged. is there a different kind of battery with the same milliAmp hours and voltage that could work? are there any li-ion batteries that can better handle overcharge? and where are the best places to look?