I have 5 different batteries and 5 vortex. Some of the batteries none of the vortex will work , some of the batteries the vortex works sporadically and 2 of my batteries that vortex always works.
So here is my observation. My bateries that the vortex works on are 3.4-3.6 volts. The batteries the vortex will not work on are 3.7-4.2 volts. I beleive the problem with the low ohms vortex is that the current limiting protection circuitry is kicking in. Once my 3.7-4.2 bats dies down to putting out 3.4-3.6 now the vortex works fine. So i would say that those using the 808's and have the higher voltage are having that problem. Also on the Passthrus, the USB hub in a computer also has a current limiter.
808 users need a vortex with 2.6-3.0 ohms for the best results IMHO
I wonder if that's why i'm burning them up? granted, it's only a 3.7v mod, but it could be.