I purchased the first generation Swytch wheel for my wife. I would give you a five star review for the product that was delivered, the ease of installation and performance. But..... my wife underwent medical treatment which prohibited her from using the bike for a year. When we tried to charge the battery after that year, it would no longer charge. I contacted Swytch about this matter. They were courteous but basically said, all batteries fail. For the time the battery was used together with the time the battery sat, I am just not sure the performance of the dead battery is up to the performance of Swytch. A bit disappointing.