We bought the "The FTETB- 750" Fat tire tandem bike less than 2 years ago. The bike is great, the battery not as much. The battery is dead in less than 2 years. Mobility4less does not tell me what is wrong with battery. I will avoid buying from this company from my experience. I would also avoid the extended warranty. And shipping is not free. It is only free if they ship it direct, which they dont, they use a third party