I have a Zappy Express pedal assist motor that will be installed on a Townie 8 step-through bike. I have been using this on an Electra Street Cruiser Deluxe which I have had for about 8 or 9 years. The motor/battery unit weighs 28 lbs. Has two 12 volt batteries and a 24 volt motor. Does anyone have a similar outfit? Is there any way of converting to lighter Metal Hybride batteries (or some such name) which owuld be much lighter. General info on this setup or any similar would be appreciated.