Will adding a external battery to my ES2 will make it turn into an ES4? April 28, 2020 03:00 Yes, adding an external battery to your ES2 will increase both the range and the maximum speed. Related articles How to cancel the speed limit mode? How to reset the Bluetooth password? Rebooting your scooter to factory settings How to operate the folded switch position? How to remove external battery? Comments 1 comment Sort by Date Votes Arriosto Perez March 21, 2021 06:17 Hi, Sir / Ma'am, I would to inform your office that I've updated my latest firmware, but said firmware decreased the es2 scooter maximum speed to 25 km/hr. only. Can I request to Segway Int'l., that to please send me a " firmware that would upgrade my latest maximum speed from 25 km/hr. back up to 28 km/hr. ( or higher up to 30 km/hr. If possible ). Looking for your kind consideration and usual accommodation regarding this concern. Thank you so much. 0 Please sign in to leave a comment.