The lighter weight of the Prolog makes it much easier to maneuver on the road and much much easier to pick up than a typical e-bike. That was a goal for LeMond, as they want as many people as possible to be able to use the Prolog. And in case you forget to charge the battery before your trip, and find yourself using your charge before reaching the final destination (speaking from experience, you will not be left with a bike that is a bear to ride without power assist. That said, you can count on the battery to meet the 40-70 mile expected range.