A wet/dry utility vacuum with a canister, a powerhead assembly with a fan,
a shut-off device that prevents the fan from drawing liquids into the fan
inlet when a volume of the liquid in the canister exceeds a predetermined
volume. The powerhead assembly includes a controller that permits the
utility vacuum to be operated in a desired power mode so that the user
may employ either an AC power source or a DC power source, such as a
battery pack, for example. In some applications, the battery pack may be
interchangeable with the battery packs of various cordless tools,
including drill/drivers and saws. A tool set and a method for operating a
battery-powered tool set are also provided.