One of my girlfriends borrowed my second E-bike which is a Rad City step thru 3, and she said she accidentally touched the key to the battery port and it sparked. I changed both the fuses in the battery twice and I still can't get the battery to work. When I press the button on the battery it has three green lights to show it is charged but when I put it into my bike and I turn it on, it turns on for about one second and the display goes black, it won't read the battery. Is it ruined now? Or is there something else I can try? Thanks so much.