Backpack Lithium-Ion batteries with high power capacities for long battery life, USB connection, and Bluetooth® interface for connection with STIHL connected. Sturdy housing with integrated carry handle and charge-level indicator (six LEDs). Can be directly connected with RMA 765 V. In combination with the AR L carrying system and AR L connecting cable, suitable for tools with a socket and in combination with an AP adapter for tools with a battery slot. Can be used in the rain.