BESTSUN 3.7V 18650 2800mah Rechargeable Lithium Li-ion Protected Battery 18650 Battery Charger for CREE LED Headlamp Flaslight Bicycle Light, etc. Lithium Li-Ion Rechargeable 18650 Battery with IC Protection, Protected Board With overcharge / discharge protection function Travel charger folds up for easy transport Charges 1 or 2 batteries simultaneously This 18650 battery is compatible with various kind of CREE LED flashlight and headlamps, bike lights