Solar Battery IFR14500 AA 3.2V 600mAh LiFePO4 Battery For Solar light. Quick Detail: Application for microphone, can replace 2 set LRAA battery. IFR14505/IFR14500 500mAh, 400mAh, 300mAh, 250mAh available too. Long cycle life, no memory, environment friendly. Stable discharge voltage.