The battery isn’t included with the Prime300 because of both shipping logistics and pricing. Shipping the battery with the grill requires different shipping methods and warning labels which would drive the unit price higher. Additionally, the Prime300 Pellet Grill can be powered by the included AC Adapter. Therefore, the main unit price can remain lower for those consumers that prefer AC adapter operation. The added cost of the battery is only incurred by those interested in the battery-powered operation of their pellet grill.