I have been using them in my Tesla and Vamo and they seem fine. I do not recommend them for a mech mod though.

I got mine out of a Toshiba battery pack though. What is weird about these is the fact that all the ones that I pulled out of battery packs 32 in total all have blue around the positive connection not White like in this picture. So are these really authentic? do not know... perhaps they made 2 different versions?

the two pictures below are of what I know as an authentic UR18650A battery. The second picture is hard to see the UR18650A stamped into the side. I tried to use a marker to darken it but its still hard to see.
http://i.imgur.com/akvNnnb.jpg
http://i.imgur.com/deWdIDA.jpg