I’ve tried this on a couple of photo trips and most recently in Iceland – a power inverter. This little gadget will take the DC power supply from a car cigarette lighter and convert it to AC for charging your various portabe devices and batteries. Much easier than having to buy separate ones from each gadget company you can just use the inverter to charge everything with their standard chargers. I’m all for reducing the number of pieces of wire and charging device that I have to keep track of and using this makes things a little easier when you have anumber of different devices with you. I charged my Mac powerbook, Nikon batteries and AA NiMHi batteries using it with no problems. Works best with the engine running, so you can charge while driving from place to place. The model I have is pretty lightweight and was easy to pack for my Iceland trip. You can find them all over the web or at electronics shop, they are inexpensive and work, as far as I can tell, around the world in any car out there.