Mark,
Super Cheap Auto sell a 1200Amp 24Ah Jump starter for $129 and we have found this more than enough to run the LX90 for 3 or 4 sessions in a row and still have plenty in reserve, but an LX90 from memory only draws about 1.5amps at max. slew so power drain is minimal. As for your laptop I don't know but I reckon a seperate power supply would be the way to go.
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