Tom Walker wrote in a message to Roy J. Tellason:

->  TW> to .75 amps. And of that the Screen Back light draws about half of
->  TW> that. The big prolbems in that people want them as small and as
->  TW> Light as possable so they build them with small batteries. People
->  TW> Gripe about the 2 to 4 hour usage with those batteries yet would
->  TW> scream Lowder if they had a Bigger(Heaver) battery.

-> Not me!  I surely wouldn't mind a few extra pounds if I could have 
-> it increase the runtime to something nontrivial.  But the market 
-> doesn't seem to be offering me that option lately.

 TW>  Before Li-ion batteries became standard on most laptops one could
 TW> get those as a increased run time option. There is a real solution 
 TW> comming on line at some point in the Future though. And that is 
 TW> the Fuel Cell battery.

Funny you should mention that,  as I did see that in a magazine a while
back.  The machine in question got something like 20 hours of runtime on
it,  compared to 3-4 hours on a standard battery.

 TW> For the outdoor types there are special Solar Cell arrays also
 TW> avaiable. But when the sun goes down you need to wind up yuor work.
 TW> :-) :-)

What,  you can run one off one of those but it won't charge the onboard battery?

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