Cordless hammer drill number of batteries without batteries battery management replaceable battery power supply battery operation series festool bhc gear variable speed tool holder sds plus weight 23 kg idle speed max 1 300 rpm blow count max 5 700 countsmin torque max 25 nm drill diameter in concrete 18 mm drill diameter in steel 18 mm drill diameter in wood 68 mm dimensions 280 x 88 x 237 cm power supply battery operation battery capaci