A Mercury Authorized Dealer will work with you to outfit your boat with the battery capacity you need. You can choose to connect the 20e tiller model directly to one 2300Wh battery for peak simplicity and portability. Outboards with remote controls and the 35e model require an Avator Power Center and at least two batteries. The Power Center allows you to further extend your range and runtime with either outboard model by connecting up to four batteries.