Cordless lawn mower electric lawn mower series bosch rotak cutting width 32 cm max lawn area 150 m min cutting height 30 mm max cutting height 60 mm cutting height steps 3 positions battery voltage 36 v battery capacity 13 ah type of battery li ion discharge rear discharge grass box capacity 31 litres start system electric start features central cutting height adjustment safety features engine stop blade brake 2 handed safety lever housing mat