Here's something to try, it happened to me just last week. I was getting light vapor and no throat hit, so the hunt commenced. First I tried the cleaning, new atomizer, and rechecking the contacts route, same results. Next I tried a pair of disposable CR123 batts (work great in a pinch), vapor back to normal, throat hit, it's all back. So now I'm ...... cause the batteries are only a week old. Charge the batteries, test with a multimeter, 3.72 volts. Hmmm good voltage, bad vaping. So now I think my charger is bad. On a whim I multimeter the wall wart, 12v just as it should be. 120mah, not nearly the stated 360mah. I dig around in the parts box and I find a suitable wall wart, 12v, 720mah. Now all is right in the vaping world again! The old wall wart wasn't supplying enough mah to charge the batteries properly. So just because your batteries have the right pressure(voltage), doesn't mean they have the power(amps).