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Woke at 2am the other day with an answer for your question: a computer UPS should do the trick. Its a battery with 240 inverter attached, just not clued up on what sort of running time you'd get but pretty sure the battery inside is 12v and you should be able to just dismantle and wire it to a larger capacity battery of the same time and it should charge it up and run fine, or daisy chain a few more batteries. They don't need to be connected to a computer to work, plug your laptop power pack into the 240V output on the ups then plug the ups into your mains and just unplug this one to wheel outside, the ups will detect the mains input is gone and just continue outputing 240v through its own inverter to power your lappy. Get a brand name UPS for some degree of certainty the inverter is a clean sine wave, cheapie chinese off ebay and expect it to provide flames at some point (nice on these winter nights).
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