EBL 600mAh 9V 6F22 Lithium-ion Rechargeable Battery with 9V Battery Charger Battery: 6F22 9V 600mAh rechargeable li-ion batteries Package: 1 pack rechargeable 9V battery and a 9V rechargeable battery charger This charger can charge 1~2pcs 9V lithium,Ni-MH,Ni-Cd batteries Recommended for smoke alarms, professional audio and medical devices No memory effect,improved low self discharge makes it still maintain 75% of capacity after 3 year of non-use