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DC-DC 9V/12V/24V to 5V USB 2A Step Down Power Module Vehicle Charger
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Those modules would be a lot more useful if they came with a plastic case/cover.
Can you even buy such a thing? You can't even easily chassis mount it. How to people normally use them? Duct tape?
The DC module is good for turning any sufficient battery, .e.g. from laptop or powertool, into a "power bank".