I am going on holiday next month, and I want to be able to use my laptop in the car, plane, ect. Specs are in my siggy. My question is this-what can I use to charge my MacBook in the car? I looked on the Apple UK Store and batteries are £99 ! I found this (link-if the link goes down its a Kensington 70W AC/DC Power Adapter for iPod, iBook & PowerBook). Thanks!