I was trying to use a different battery to power my old Bionx bike, but in the process, I'm pretty sure I accidentally connected the negative and positive ends of the battery in reverse, being the careless fool that I am. Now the bike doesn't run at all, even with the proper battery. What exactly happened? Is everything completely fried? Are there only some things I need to replace? The bike was one these four models, but I don't know which: P-250, PL-250, P-350, PL-350. One of the older models if I'm not mistaken.