Two years ago, it looked as if NiMH (nickel metal hydride) batteries, with their increased power and longer runtimes, were about to replace NiCad (nickel cadmium) batteries and revolutionize the cordless tool industry. Today, however, NiMH batteries are still relatively scarce. While two manufacturers are going full speed ahead with NiMH technology, many are taking a more cautious approach and some have backed away completely (see "Who's Using NiMH Batteries?" next page). NiMH vs. NiCad Battery size and weight limit cordless tool designs, where smaller and lighter means "better." Typically, the higher Amphour (Ah) ratings of NiMH batteries provide between 15% and 40% more runtime when compared with the same tool running on a NiCad of the same physical size and weight. And while