The 1000w/48v ebike kit I bought said to use no less than 17ah batteries. Not wanting to spend the money on Lithiums, I went for 4x18ah SLA's and they're really just too heavy and I'll be using them on a trike build. I'll be fine with half the capacity on the 1000w 48v bike, so want to go with about 9AH batteries at half the weight but for some reason many if not all the 1000w kits advertise the need for no less than 17AH batteries. Isn't the difference just a matter of capacity? or is there something else going on there where less than 17AH batteries won't work? Not enough Amps to run the motor properly?