Did the Lake Tahoe shoreline loop in my electric kayak and camped at the clothing optional beach with the big submerged granite boulders. About 75 miles of shoreline over two days at a speed of 5 mph. This is what I put together for the kayak. (8) 100 ahr cells for a total of 2.6 kWhr at a weight of 60 lbs. Energy density of these LiFePO4 prismatic cells is about 1/2 that of the Panasonic 18650 cells used in the S bank. Each cell is 100 ahr vs 3.1 ahr of the 18650.