A spare rechargeable battery for the GamePro Marsh MS4400 LED spotlight. The Marsh runs from a detachable battery pack, so carrying a charged spare means you can swap it in the field and keep spotting when the first one runs flat, instead of cutting a hunt or patrol short. Retail listings for the Marsh describe its battery as a detachable 12.6 V 2,600 mAh lithium pack that charges by USB-C in about 3 hours and gives roughly 1 hour on High and 2.5 hours on Low. The Marsh can also run directly from a vehicle's 12 V socket. Check that your spotlight is the Marsh MS4400 before ordering.