While buying an off-brand or refurbished power tool battery is tempting, don't do it. Cordless power tools are available from several big-name brands, each using its own expensive battery. . However, any power tool lives and dies by the quality of its battery — if that becomes damaged, you're basically left with a glorified screwdriver. Whether you rely on power saws, angle grinders, orbital sanders, or anything else, you don't want to rely on a faulty battery. Walk down any. . Judging tool quality is highly subjective, as the durability required by a professional tradesperson working eight hours a day differs significantly from that of a homeowner using a drill once a month. The designation of a “worst” brand often stems from a mismatch between user expectation and. . Cordless power tool battery's from major brands like Makita, Milwaukee, DeWalt, BOSCH, AEG, Hikoki, Festool, Hitachi, Ryobi, Ridgid, Metabo and Ozito all offer their own expensive battery systems.