The first batteries were to change my bike a month ago, and I ride 35 klm while pédallant. (Just to help a little in the ribs and wind). I am very happy with this bike. it is a little heavy, but with me, there is a assenseur, so no problem to mount it on my balcony. One of my friends had two wings bike in his basement, and when he saw my SCHWINN, he said "TEXX. I have what it takes for your SCHWINN. The owners of schwinn accessories like mine, are welcome to discuss their performance and also their price ((very affordable)) for this time, at CANADIAN TIRE . . I meet a very nice guy on the bike path, and bicycle schwinn accessories I-ZIP, was equipped with 2 motor system. There aa install a kit on its Bionix SCHWINN. And also, a second 24 volt battery on his luggage rack . . I paid $ 250. 00, and the battery was changed at the beginning of August 2010 ($ 115. 00), avec14 mah, mah instead of 12. I made a good deal. If I travel a long journey and I find myself at a friend or relative, I bring my chargers and if the need is there, I can always recharge my batteries (a few hours of relaxation) for the return. .