The Surface 2 has a weird power connector. That makes it difficult to charge it from a battery power pack. This blog outlines creating one from a  DC 12V 36W Car Charger Adapter for a Surface 2. Building it wasn’t too difficult.  This means I can now use my Surface 2 on long journeys without need to access main power to charge it. Cost about $A40 apart from the Surface and Power Bank.

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