[COLVERT]

Originally Posted by another_clean_sheet

Being pedantic it is not the amount of volts that kills the mouse but the amount of current going through its body. Does not answer your question. Can you wet the plates so as to improve the conductivity when the mouse goes through the gap?

It's voltage that kills not current.

If you wet the plates you'll short out the trap and maybe blow some fuses.--

You can quite safely touch both terminals of your car battery at the same time. It has enough power to turn your engine over but is harmless as it's only 12 volts pressure.