7.4V, 5200mAh, Li-ion Battery fits Aetep, At800, At-800, 38.48WhBattery Fits Models: At800, At 800, At810, At 810, At820, At 820, At830, At 830, At850, At 850 Battery Part Numbers: Be 6398, Be 6784 Although a generic version of the battery, the battery we supply is designed and built to be as robust and as good quality as the original OEM battery. The products we supply will work for the device that it is provided for and is built to last as long as the battery that came installed originally. If you have the