Sat at the top of the Ninebot scooter range is the ES4, with an impressive top speed of 19mph and a 28-mile range, it's easy to see why it's a top pick. You also have the opportunity of turning your ES2 into an ES4 with a simple battery upgrade. Simply put, the upgrade gives you increased range, extra performance from the motor, increased top speed and improved hill climbing ability. A sleek design weighing just 14kg! Happy scooting!