in our "car" 1.8 x 44 = 79.2 x 1.2 = 95 ah batteries at 144 volts needed to go the 44 miles. A lot of people wish to go close to 100 miles in our experience. To make it simple, for this car to go say 88 miles (double the 44 it is capable of now) the total Kwh of the pack has to be doubled.