I like discussing ebikes so If I came off a little harsh then I'm sorry. My first kit is built and am awaiting a 48V LifePo4 battery.I've been studying this technology for 3 months and came to the conclusion that for me I wanted a modular approach. Each componet of the kit is available from multiple vendors and the total price was comparable as well. If I don't like one of the componets, changing it to something more suitable from another vendor is easy and affordable. That does require research and is something I'm good at.

Battery technology is evolving rapidly and the demand is exploding. Many new people are getting into the manufacture of batteries. Most of this is in China.There are people supplying quality goods from China. The ones I've decided to use are my Quality Control Department.The reason I'm waiting for the battery is that they will test it. I'm talking charge and discharge cycles that take about a week to complete. I didn't just read their ad and say that's the one. I found forums that were brutal against vendors just out for a buck.

Mirocar13 may not agree with you but he is supplying something to consider.