Cordless lawn mower electric lawn mower series bosch rotak cutting width 43 cm max lawn area 450 m min cutting height 20 mm max cutting height 70 mm battery voltage 36 v battery capacity 4 ah type of battery li ion charging time 140 min discharge rear discharge grass box capacity 50 litres start system electric start safety feature engine stop blade brake housing material plastic power supply battery schallleistungspegel 90 weight 14 kg