Xtar Li ion 18650 Rechargeable Battery This 18650 Li Ion Rechargeable Battery is a 3.7V 2600mAh battery designed to be used with the FUSION 1050 although it can be used with most items that require an 18650 battery or two CR123A batteries For use with FUSION 1050 FUSION 530 IFL 660 R IFL WA ZOOM R Volts 3.7 voltsMilliamp Hours 2600 mAhWatt hours 9.62 watt hoursRechargeable YesTop Style Button TopBattery with intact cathode tip protruding 1mm minimum is required to make contact Every Xtar 2600mAh 18650 battery is supplied in a tough plastic box which should be used to protect the cell when it is not in use