Anyone found good 5-volt options for use with cartomizers? I'm currently using a Kensington Portable Battery Pack with my VK passthrough as my primary around the house and at work. It works great and is reasonably portable, except of course for the dangling wire. Batteries, even the extra long, don't perform as well as the PT (though the XL comes close). But, I fall back to batteries when I'm out and about and don't want to deal with the wire. I've considered a Protege, but it appears to be 3.7V only. I like the idea of something fairly slim. Any ideas? Side note: I've ordered adapters for my Puresmoker USB Pass for use in my truck. I like the ruggedability it offers, and it will be my permanent solution while driving.