Advertised on Amazon.com is a LI Mn204 36V/12AH battery powered fold up weighing 55lbs with an additional 8 lbs for the battery. It has a 110v-240v charger and best of all, a 6 speed Shimano gear arrangement. The price is $1399.00. The manufacturer is described as E-Ridz. I am particularly interested if anyone out there can tell me about E-Ridz, because I would have to purchase this machine on-line, without ever seeing it. So far I have not found a way to contact them directly to find out, amoung other things, the cost of a replacement battery, and indeed, if the battery that comes with the bike is of the more advanced kind, manufactured after 2007. Flecc, your input on this, among others, would be most appreciated.