Interesting. Usually when I buy from Ebay the results are mediocre at best and the seller demands that I give him a full star review. I don't have the ebay foo or the patience that you have. I've bought cell batteries from a ebay seller that looked very much like what you recommend, and they were junk. I also bought from a random, supposedly reputable dealer on Amazon, and they were junk (brand name, two year old batteries). Went to a local store specializing in batteries and they were junk too (also two year old, brand name, batteries). The problem with a lot of vendors is that batteries have a shelf life. If the new batter is more than a year old, it's not going to perform.
I'm trying Anker now and will see what happens.