I have a PT in my truck from V4L and a Saber Touch mod in my hand. I love my Saber Touch from VaporMoon, as it is 5v regulated. What this means is, the voltage is regulated to be at 5v from the first time you hit a fresh set of battereis, until they need to be charged again. I get 24 hours on a set of batteries, and never lose flavor or vapor production, until the batteries just WON'T perform anymore without being charged.