The motor won't resist you. It'll feel almost like there is no motor at all. There is virtually no resistance.

If you are going to buy lead acid batteries for the e-bike, I wouldn't even bother getting an e-bike. Sorry to be so straight forward but lead acid sucks and you will be angry I think having spent money on it if you go that route. Just trying to save you some aggravation. Go lithium, NICD, NIMH, LIPO or don't bother.