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Lithium-ion and nickel-metal-hydride batteries are helping the latest cordless drills run longer and stronger for everything from hanging holiday decorations to battening down decking boards. Different cell chemistry from batteries in laptop computers also means those in drills aren't likely to overheat on the job.
Six of our top-scoring models now run on lithium-ion (Li-Ion) or nickel-metal-hydride (NiMh) batteries instead of the usual nickel-cadmium (NiCd). Since the new batteries deliver more energy per ounce than NiCds, they often allow the drills to do more work for their weight. One top-scoring, Li-Ion Milwaukee model ran 30 percent longer than last year's ...