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I bought the MiGear jumpstart thing from Tricky Dickies when it was on special a few months ago. It has a 17Ah SLA AND it has an inverter (plus an air compressor!), was a bargin at $75 but now that it's back to it's normal price ($150) I'm not so sure. But from memory the adapters to go from 12v cig socket to whatever voltage your laptop charges from are about $100 anyway.
I have only charged my laptop once from the MiGear and charging the internal plus battery slice (total 8.8Ah) completely drained the MiGear battery.
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