Ninetendo  Advance SP, GBA SP (GAMEBOY), SAM-SPRBP Replacement Battery Replaces Game Boy 3.7V BATTERIES: SAM-SPRBP FITS NINTENDO Following - Ninetendo  Advance SP, GBA SP Battery Type: Li-on Battery Voltage: 3.7V Battery Capacity: 900mAh (Extended battery for longer life) IS YOUR AH RATING IS DIFFERENT? The AH (Amp Hour) Rating is the storage (or fuel) of the battery, the higher it is the longer the battery lasts between charges, bit like petrol in your car so a higher or lower one makes no different to the performance, just the length of time you can use the battery for between charges. Revitalise your Gameboy Colour: N/A