Diablo Mini Chopper Mini Chopper Help!!!!!!?

Mini chopper help!!!!!!? - diablo mini chopper

I have a mini chopper with flame bright yellow and red as the color of the bicycle as a whole. My battery is in very bad condition, so if I start, I have cable. Yesterday, when I jumper cable, the backup automatically. I tried it again with a new fuse and burned. What is the cause of this problem. Please help !!!!!!!!