Robust design meets maximum runtime. High-capacity, backpack-mounted battery for maximum productivity and longest operating time. The sturdy construction allows for daily professional use in any weather. The LED charge indicators on the battery, along with the precise battery level that can be read from the adapter, simplify work planning for the user. Two fans actively cool the battery, and the intelligent discharge system protects the battery cells from deep discharge, ensuring a long battery life. Without strap and adapter.