The regular sized EASYFOLD wheelchair comes with one battery, but you can add a second battery into the other side arm of the chair. This will increase your travel range from 12 miles to 24 miles per charge. The battery is designed to fit inside the side arm of the chair, so it does not take up any extra space on the chair. Our competitors put their battery under the seat, which takes away from having additional storage. We have thought of everything to make sure every inch of the chair is intuitive.