Hi All. I bought a used Ebay, electric bike four years ago,.36v 250 watt rear wheel motor.. Quite pleased with it. But the lead acid battery weigh:s in at 28 lbs...Ran out of power,8 miles from home.Like pedalling a Sherman Tank?. I am in the process of making a 36 v , li ion cell, battery,approx 1/ 5th the weight. I.will keep you posted with progress.. Regards,,Spartacus