The SL-B26 (18650) Battery Charger is a must have for loyal Streamlight enthusiasts. This charging cradle is capable of charging a single SL-B26 (18650) button-top lithium ion battery or two simultaneously, up to 500 times. The cradle has a sturdy, impact-resistant polymer construction and was created for SL-B26 (18650) Streamlight cells. Charge up your batteries - one or two at a time - in the clever dual input cradle. It is compatible with USB adapters or "traditional" AC/DC power sources for a wide variety of options to restore energy. Streamlight is best known for high quality and reliable lights, and the SL-B26 (18650) Battery Charger will keep these essential tools in working order.