A wide variety of batteries are available to power cordless tools. Batteries range from 2.4 volts to 24 volts. Most screwdrivers and impact wrenches use 9.6- or 12-volt batteries. More powerful cells, such as 18-volt batteries, are typically used to power circular saws and other tools used in the construction industry. Rechargeable power tool batteries are available in either "pod" or "stick" styles.
"The biggest development in cordless technology has been high capacity batteries that can handle high currents," says Dave Selby, business unit manager for cordless products at Milwaukee Electric Tool Corp. (Brookfield, WI). "Robust power packs, such as the 2.4-amp-hour nickel-cadmium battery, have enabled larger, higher powered tools to tackle applications unthinkable just a few years ago.