The STEELMAN PRO 79063 Slim-Lite / Command Post Extra 18650 Battery Power Kit includes a spare lithium ion battery, charging cradle, Micro-USB cable, and AC adapter to ensure that your light never powers down. Designed specifically to work with the single end contact modified 18650 Li-ion rechargeable batteries used by STEELMAN PRO Slim-Lites and Command Post flashlight systems, the charging cradle has a built in indicator LED that shows the charging status of the connected battery. It also features embedded magnets that allow it to be mounted horizontally or vertically on a steel or other ferromagnetic metal surface. Compatible with STEELMAN PRO part numbers 78606, 78708, 78952, 79057, 79419, 96792, and 96883. NOTE: The included 18650 Li-ion battery is not compatible with standard 18650 devices and charging systems. It has been modified with a single end contact circuit for compatibility with the Slim-Lite / Command Post series of work lights. This modification has extended the overall length of the battery by approximately 1/4-inch.