Segway Ninebot ES2 battery is a 5200 mah decent size battery. It can help you carry around 15 miles on a single charge if the conditions are perfect. However, the travel range can vary depending upon the road type and rider weight. This mid-ranged battery power is relatively easy to refill in almost 3.5 hours, which is very good for ES2 as many competitors in this price range take more hours to charge with nearly the same mileage per charge.