Go onto alibaba or a similar trading site,search the batteries,a lot of these factories only deal in 100+ or 1000+ maybe even 10,000+ units BUT will be willing to send out samples,I used to do the same sort of thing when I first started buying hydro-tents for sale,used to get them from China cheap as chips and add £40-50 quid on top,that e-bay seller is based in Honkers,my money says he is buying the batteries from across the border in the SEZ and sticking his bung on top,try and get a sample from a factory,who knows...........???