1)3.7V 18650 li-ion battery 2)used for led torch,and games,toys 3)with safe protection circuit 4)No memory effect 1)3.7V 18650 li-ion battery2)used for led torch,and games,toys3)with safe protection circuit4)No memory effect Supply 3.7V 18650 Li-ion battery,rechargeable 2600mAh