So I had this kid that didnt want his hoverboard so I bought it from him and when I plug it in the lights turn on and all that but the motors dont work. So I took it apart and I think I have a battery issue but I am not certain. When I hit the on button it doesnt turn on at all. I took the shell off and have let it sit for a around a year but now I want to repair it. This is the hoverboard. 
https://floatingfeet.net/