This is my second Tidalforce M-750X that I'm selling on eBay. It's a lightly used, and I've replaced the front hub battery with a 36V LiPO battery made from Turnigy Multistar cells. Very light at around 5 lbs and very strong. I've also added a Large Screen Cycle Analyst V2.23 to the system to monitor the battery.
http://www.ebay.com/itm/181815136380
Sale ends this Sunday August 2nd.