not wanting to pay high price for original replacement batteries i thought i'd try aftermarket ones. being they were for my older but still good condition craftsman back up drillthey were shipped quickly, looked like factory batteries, (except for craftsman logo). i charged to make sure they where at full charge, and used, seemed to have plenty of power, but they started losing charge before factory batteries would have, but ordering 2 i figure i would always have another ready when 1 went dead.See full review