folding electric bike, lithium battery, longer lifetime, longer distance per charge, light and handy, beautiful ... in appearance 20'' Folding Electric Bike with Lithium Battery (LC-TDZ-2003B):selling points: top quality and performance, longlife ... , bus, or elevator, energy-intensive and energy-saving, very stable, safe and environment-friendly Tire size: 20" X 1.75Frame: 6061 ...