Besides pricing reasons for the company selling the item, why can’t people make a female connection from the wall plug into a battery/battery adapters?
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It would be cheaper to make a mains-powered drill that uses a high voltage motor, than to make an electronic power supply to power a lower voltage drill from the mains. We’re typically talking about over 500 W of power which, from a 12 V battery, is 42 A; a very chunky power supply.
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