IIts just so strange, over on the torch forums which I am also a member of, Efest are a very trustworthy brand to them, recommended all the time. They got pretty mad when I told them about the 30 AMP rewrap being 4-6 amps in reality, and said it must of been an error or something, Efest are trustworthy and so forth.
Only a few members were reasonable with me, but in the end it ended OK and I made friends with Efests biggest fan, as he builds insane torches, and uses Efests for them. He says they top all other batteries he owns. He also is one who does the testing over there.
I then decided I am going to get battery advice for my vape from here, for my torch over there, as they was confident in Efest and their claims. I would use an efest in my torch, but am scared to in my vape.
I even showed them proof of it happening, and it was explained away as a 'supply and demand' problem, surely not all the time Efest would do this with the 3100MAH (I think it was that one if memory serves correctly, it claims 30 or so amps, but is a panasonic re wrap that really provides a quarter of that at worst, 10 amps at best depending on the battery they re wrapped).