some guy where my husband works has one. He has to put extra batteries on it when he rides with the hubby just to keep up
ditch the heavy bike and batteries and work on your leg muscles/cardio vascual system instead - happier, healthier, stonger, faster!!
(this is the same joe who insisted that the hill up to his house was
impossible to climb on a bike - so of course we had to go do it - while we were there riding up and taking photos, some old croper on an 80's era steel Trek, aerobars and all comes cranking up trying to find his friends house. That bike must have weighed 25 lbs at the very least and even
he didn't have any troubles making it up that hill. Granted it was steep - probably around 18%, but not impossible, not even incredibly hard)