Surely any 10 hour flight would at least have sockets for your charger?

If you can stand a smaller screen/keyboard for a while. Maybe a Netbook would solve the problem?

I recently bought a Samsung NC10 and have had good success running everything I want to on it (gvim/Firefox/Firebug/Python/Komodo Edit/Eclipse/Django/web2py under Windows XP and Ubuntu 9.04 installed via "Wubi").

I haven't managed to use up a battery. The claim is 6 hours and I tend to believe it based on my experience. An extra battery would go very far.

Or you could simply buy one or two extra batteries for your current laptop.

http://www.apple.com/macbookpro/features.html

Wait a bit longer until the ARM baed netbooks (and smaller machines) startarriving. ARM just announced a dual core hard-macro to address the market, and the Intel Atom can't match it on battery life (hence ARMs use in most phones).

- Paddy.

Frankly, I don't sit often enough on 10h plane journeys to do much about this. Although a 2nd battery might be generally tempting.

My thinkpad x61s with a 9-cell battery gives me 5 plus hours which is very convenient.

My macbook pro gives me 8 hours of battery bakckup..with airport turned on.It wil give a bit more if wifi is not needed..