Hoverboard Replacement Battery, 36V is same as 42V Model: JT-BC200 and JT-BC200-09 and JT-BC200-10 and JT-BC200-100 Capacity: 4Ah Power: 144Wh Red+ Black- Please check the size/shape of battery before place order, there are many different type battery cases for same model number, I have attached dimension pictures in the listing so you can easily to compare, battery is not universal fit, may not fit into your hoverboard. All battery will be test before shipping out, contact us if charger stay green, most likely is charging port issue.