Under Voltages

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I know various manufacturers have outputs from their powerbricks ranging
from 14 volts IBM to 18 volts Compaq.

What exactly are the potential damage caused by running less than the
rated voltage (amperage remaining the same).

For example the two units I mentioned before what would happen if I had
only 12 volts available?.

I know batteries do drop in voltage output as they discharge so does the
circuitry allow for a voltage drop and then cut out at say 7 volts or

Thanks for any help.

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