My first eBike build was based on the Papamotor 48V, 15 aHr Ping battery kit. Papamotor supplies all necessary components, including TWO throttles and torque arms, with their premium kits. Sure, I had an issue or two but no one in this industry has better customer service. All emails were answered next day. Issues were taken care of promptly. I've had other "reputable" vendors that ignore my initial emails and are slow to ship. If you are NEW to eBikes, you cannot go wrong with Papamotor. Best deal is a platinum package which includes FREE shipping. No slow boat here. Get the kit in two weeks followed by the Ping battery pack in a few days. When you compare cost, include shipping and the value of great customer service, Papamotor is a worthy choice. For starters, see what Ping charges for the same Battery pack with shipping.......