Cordless hammer drill number of batteries without batteries battery management replaceable battery series makita bhr weight 35 kg idle speed max 1 100 rpm blow count max 4 000 countsmin drill diameter in concrete 20 mm drill diameter in steel 13 mm drill diameter in wood 26 mm power supply battery operation battery capacity 3 ah charging time 22 min impact force 2 joule included in delivery side handle depth stop