Watt hours (WH) measure the energy capacity of a battery pack, indicating the range performance of our e-bikes, e-scooters, e-skateboards, and alloy folding e-scooters. To calculate WH, multiply the voltage by the amp hours (Ah) of the pack. For example, a 36-volt 10-Ah battery pack has 360 WH (36 x 10 = 360). Each mile typically uses about 20 WH, so a 360 WH pack provides around 18 miles of range (360/20=18). Range can vary based on terrain, rider weight, and riding style.