Originally Posted by ftweb
I use the Kensington 120 Watt AC/DC Power adapter.
It has attachments for AC, cigarette lighter, and empower plugs, and is relatively light. Combine this with the seating plans on seatguru.com and you can use in-flight power if it's available.
I've also decided to try the Valence N-charge battery. I'm a little worried because I've read a lot of negative reviews on-line, but I know someone who has it and likes it. I'll post more information once I've tried it.
I have had good luck with the Valence batteries. I have two for a very power hungry 17" on Int'l flights.