Cordless drill driver series bosch psr battery voltage 108 v battery capacity 15 ah number of batteries with 1 battery type of battery li ion battery management internal battery gear 2 speed tool holder keyless idle speed max 1 650 rpm max drehmoment hart 20 nm max drehmoment weich 11 nm weight 1 kg charge indicator drill diameter in concrete 6 mm drill diameter in steel 6 mm drill diameter in wood 20 mm charging time 90 min chuck width