I got it when it had just come out from heavengifts. I thought it was some kind of super powered 901
mod. Really its just an extra long extra extra heavy battery with same output. If that's what you need, it works perfectly. I personally was a bit disappointed.
I did use it extensively on a 10 hr road trip, and two bats almost lasted entire trip chain vapping. I did have to use a few normal 901 bats.