Product detailsLi-ion 5000mAh 3.7 Volts Rechargeable battery is a high quality battery used to power Rechargeable emergency bulbs, rechargeable clippers, flashlights, toys? rechargeable fans and so on.It is recharged with electrical power and used for more than 18 hours when fully charged. It is cylindrical in shape.. It does not discharge easily and long lasting. It should be kept in a dry place.