I'm in the market for a new lighter weight pedal assist step through bike with longer battery capacity. I currently have a retrofitted trek bike which is heavy and I can't get more than about 22 miles out of a charge. I do not want a throttle feature. I would like an upright or upright relaxed position to get the weight off my wrists. The smaller frame size is very important to me. Does anyone have some suggestions? Thanks for your expertise!