I have been toying around with the idea of converting my xmark walk behind to electric. I think I found a suitable motor but now I am working out the battery configuration in my head and I don't see it being feasible. The motor is a 48v 200amp continuous brushed dc motor. I have loads of old laptop batteries that I have been recovering 18650 cells from. According to my calculations I would need 11 18650's in series and 45 of those in parallel. This is assuming the cells are rated at 2c which I cannot seem to find the specs on any of the brands I have. When I look up the pdf on them the manufacturers don't have a c rating, rather a discharge chart at different c ratings. Have I done my math correct? Do I really need 500 cells to make this work? Most of these batteries are rated at 2200-2500mah.