Lithium-Ion Batteries

Cordless-tool batteries have continually stepped up in voltage since they were invented nearly 50 years ago, but with each boost in power came added weight. In fact, a 24-volt nickel-cadmium (NiCd) or nickel-metal hydride (NiMH) drill can weigh nearly 8 pounds—about the same as a gallon of milk—and who wants to lug that around the shop or job site all day? Responding to that criticism, Milwaukee Electric Tool introduced a line of 28-volt cordless tools at the International Builders Show in January.