That first one is interesting, and at £35 good value.
http://www.mdsbattery.co.uk/shop/pro...ctGroupID=1319
The dilemma is do I buy that or the Dell specific one (above) for £15 more).
The dell one charges as well as powers and is obviously most compatible with the specific machine, but if I replace / lose / get another machine I would need a second.
Hmmm.
The other points, its BA Club World flat bed seats (most excellent what you can do with BA miles these days) so power is not a problem. BA don't seem to carry them on board, or offer a rental program.
Significant rip off difference between the onboard price and on ground price though!