Reddit reviews 3.7v 850mah Rechargeable Li-ion Battery Pack for Game Boy Advance GBA Sp
We found 2 Reddit comments about 3.7v 850mah Rechargeable Li-ion Battery Pack for Game Boy Advance GBA Sp. Here are the top ones, ranked by their Reddit score.
GBA SP replacement battery3.7v 850mah
I'd go to a well known retro site and order from them.
By coincidence, I ordered the same battery through Amazon. I haven't seriously put it through its paces though, so I don't have numbers for run-time and such.
https://www.amazon.com/3-7v-850mah-Rechargeable-Li-ion-Battery-Advance/dp/B0082X3NZQ/ref=sr_1_2?keywords=gameboy+advance+sp+battery&qid=1574131437&sr=8-2