Hello,I am looking for a replacement battery for the addmotor hithot h1. Does anyone know if theres a replacement battery on amazon or ebay thats cheaper than the on addmotor website? Addmotor website does have a replacement battery but its a little over 500 dollars and they sell the charger seperately. The battery is 48 volt for a 500 watt bike. The ones on amazon and ebay look like very similar to the addmotor ones and specs match but i am not sure if they actually directly fit. does anyone have experience or knows if those will work?