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Hi John.
I bought a Waeco Deep Cycle Battery. 33aH
It cost me $330 but I have seen them cheaper since.
It is designed to power a fridge continually for long periods, so is ideal to power a laptop for imaging purposes.
I have powered my laptop all night with a 150watt PURE SINE WAVE inverter and just plug the normal 240v plug into that.
(Don't get a cheaper modified sine wave inverter for sensitive electronics)
But if you can get a specific DC - DC power converter (to change from 12 volt to whatever voltage your laptop requires, with its correct plug type), that sounds like a cheaper option than PS Inverter.
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