This wall charger and 18650 3.7V Battery comes as a set. The travel AC Multifunctional/Universal Battery Charger that automatically stops when charging is complete. It will show red light when charging, when full it turns green & auto stops the charging. You should charge overnight at first use. Designed to charge your batteries quickly and safely. Wide range of charging voltages and battery types - see below. Functions just fine in most applications including our $12.00 LED flashlight we sell here on Wiredco.
*Input: ACV100-240V @ 47-63HZ
*Termination voltage: 3,7v to 4.2VDC+-1%
*Compatible batteries up to size 69mm x 33mm
*Sizes: CR123, Gumstick, 10440, 14500, 16340, 17335, 17500, 17670, 18500, 18650 Such as our BATTCHARGER10 Battery (See last photo)