I think the KF Bottle Battery Kit is the Best eBike Conversion Kit Awailable
I’ve purchased 7 kits over the years, 4 for my wife and me and 4 for neighbors. I am actually installing a new 29” kit on my mountain bike today. I have the following observations: Over all the design, technology and quality of production are excellent and I often recommend this kit to others. It's a great and inexpensive way to convert an existing bike to an eBike. I especially like that there is only one cable connecting the controller to the motor. I've also used the Bafang kit which has a spaghetti bowl full of different cables. The improvement with the push button OFF/ON on the battery is a HUGE improvement over the old pinhole switch. A conversion kit-maybe something in the lid, to modify the pinhole switch to a push button OFF/ON would be very much appreciated. I’ve some ideas about this myself. I see there is a small circle on the battery lid where the ON/OFF button should go The display should have the option to switch from metric to imperial measurement units. I’m comfortable working in metric but many Americans aren’t The WePower app is very good but occasionally turns off on its own, requiring a reboot. This happens if I take a rest break of more than just a few moments when cycling I’ve had one battery failure. In fact this was the extra battery I bought with the first bike kit and it has never worked. I only found this out when I went to use over a year after purchase. I ordered a kit from Rao to “wake up” the battery. It did wake up the battery but then the battery immediately dies again I was unaware when I purchased my second kit that the old batteries do not work with the new controller. I think you should make the new controllers backwards compatible or make it clear to customers that old batteries will not work with new systems. Batteries are expensive so it would be good to be able to use old ones with new systems I have mixed feelings about the torque sensor. I don’t like the lag but think it reduces the stress on the drive system. Again, overall I think this is great technology, great quality and great customer service.