OK, I just got a Vision Spinner 1300 Mah battery in vapemail today and I'm wondering if I've gotten a knockoff. First, it feels to light and insubstantial for its ostensible battery size. I compared it with my sons smok 650 mah, they're roughly the same weight. So far it seems to be functioning well but just has a tin can feel to it. Is there any way to verify its authenticity?