I have a 110V compheat, purchased from Monty this spring. I had to buy a 12V to 110V power inverter as there is no AC at my track, and anyway in europe that'd be 220V... I have 4S in my starter box, so the inverter just won't work as the voltage is too high as an input. So when I want to preheat, I use my full-size car battery, then the inverter, then the compheat.... this is a PITA, I was just sooooooo happy to read about a 12V version....

... only to hear it still doesn't take 4S And it doesn't take a lead battery either as it pumps out WAY more than 12V when fully charged.

I mean, I love the concept and I swear by the product now (I was a non-believer till I got one ) but I think that would have been savvier from a marketing standpoint to allow it to plug into the "most common" portable source of power most racers carry in their starter box already I don't have much space in my Hudy starter-box to add another 3S lipo in there , plus I'm not sure I want to either.

Paul