Any commonly found 12v battery will power the light. Since its a low draw (2 AH) light, you don't need a really large battery. If you plan on using it for extended periods of time then we would recommend a deep cell marine battery. The best way to size a battery and determine how long it will last is by the amp hour (AH) rating on the battery. A 2 AH battery will last 1 hour, a 4 AH battery will last 2 hours, and so on. Do get AH confused with cranking amps as they are different. Many of our customers just use a small motorcycle, power wheels, or golf cart battery.