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William Sommerwerck William Sommerwerck is offline
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Default Powering cordless drill motor with DC transformer

To the best of my knowledge, it's the impedance of the motor that (for a
given voltage) determines how much current flows. The battery is not
generally the limiting factor.

You can use a lower-voltage batttery pack, but the device's performance will
suffer.

As to a car battery damaging a drill rated at 13.8 V or higher -- absurd.