The Panasonic NCR18650B is a button top battery model with a reusable and rechargeable 3.7 volt Lithium ion battery. With a standard 18650 battery-size, it can fit in a variety of household electronics, and with a capacity of 3400 mAh, and an energy charge of 3.4 Ah, it is guaranteed to deliver enough power for an optimum performance of the gadget.