Review on Rechargeable Lithium-Ion Battery Kit With Tool Pack For Nintendo GBA SP/Game Boy Advance SP - 850MAh Capacity by Brady Penczak
Not 850mAh for my opinion
Absolutely not an 850mAh battery. Lasts less than an hour on modded GBA, even less time than the 20 year old OEM 600mAh battery.
Pros
- This is a battery. I installed it and it worked.
Cons
- May require additional hardware modifications to work properly
