The Festool 5.0Ah 18V AirStream Battery Pack with Bluetooth is the all-rounder, all-singing, all-performing heart of Festool cordless range. The powerful all-rounder performs impressively with excellent output and long running times per battery charge because of the perfect combination of the battery pack with brushless EC-TEC motors. Thanks to AIRSTREAM technology, the battery pack is actively cooled with the AIRSTREAM rapid charger before and during the charging procedure, meaning that it is ready for use again extremely quickly with maximum charging power. With built-in Bluetooth connectivity, you can automatically start a paired mobile dust extractor as soon as you activate your power tool, thereby ensuring you have a clean working environment, free from dust and debris. Furthermore, stay future-proofed. The Festool WorkApp enables clever additional functions in combination with the Bluetooth function of the battery pack, such as the detailed display of the charging status and further operating data such as temperature or charging cycles. To quickly and easily identify the battery with the lowest charge status, you can flash the LED indicator directly on the battery pack. Software updates are also possible Install the newest version to work with the latest tool functions at all times Please note that this battery is not suitable for ETSC 125, RTSC 400, DTSC 400, CTC SYS