Amazon.com : stio 4 Prong Charger for Ninebot S/S-MAX/Mini PRO/Mini lite, 63V 2A Power Supply Compatible with Ninebot by Segway Go Kart Kit,Gokart PRO 4 Pin Notched Connector Lithium Battery Charger Power
Battery Replacement on Segway miniPRO - M4M
Lithium Battery for Segway miniPRO and Ninebot S by Segway 236wH - M4M