For me it's usually the other way around and Alibaba charges me $600 for shipping of 4 batteries. Including shipping and taxes it is still cheaper for me to buy from Amazon. I've usually has good experiences with "buyer protection" from Amazon. I just wanted to know if they have been tested by someone. I know not from this exact supplier.
Saying prototype doesn't inspire much confidence.
Those 1000ah batteries look sick, but a little too much for now.