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For the price it would cost to upgrade to a laptop with 24hr battery life, you could build a power box like Andrew (RB). 12v 112AH 800CCA deep cycle battery, 1000w 240v pure sinewave inverter, couple of 12v cigarette lighter sockets etc etc.. and have plenty of spare change...
That would run your mount, cameras, laptop, dew heaters etc for quite some time...
Pros:
Power for everything you use, anywhere you go.
Long battery life.
Cons:
Heavy.
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