A few points:
1. "The above is going to take a 48v ebike and a solid 20ah of battery capacity.If you want to do 20ah at 48v using SLA you are going to need 4x40ah 12v sla battery's and one big trailer to put them in ."
Kurt's math is wrong. 4 x 12V = 48 v for batteries in series. The current...