Ugh, eBay...$45 wow. eBay has been flooded with fakes, lots of people getting hit.
Honestly those look pretty good though, I would say they are authentic based off the pictures you posted. They don't appear to have any of the telltale signs of the counterfeits. If you could, would it be possible to post close up pictures of the QR code and each end of the battery? That will tell me more definitively if it is 100% authentic. As it stands, off the pictures currently...I would say authentic.
I am comparing your pictures to my known authentic VTC5's and they're basically identical.