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The mount draws 4A when it's slewing. My EQ6 draws less than 1A when you're just tracking. I personally use 2-3 38Ah Deep Cycle batteries. These last me about 2 days without needing to recharge. Just a note about 12V Lead acid batteries, don't let them fall below 12.3V at a minimum. It'll decrease the battery life and doesn't do your electronics any favours.
If your surface pro is anything like my laptop which charges using USB-C there are some PD mobile power banks that are suitable. I have one that can deliver up to 45W and can charge my laptop 75% from flat.
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