The Festool 18V 4.0 Ah Li-HighPower Bluetooth AIRSTREAM battery is designed for maximum performance and comfort during work. With its light weight and compact size, this battery offers a perfect balance between power and ease of use. Special featuresWork without fatigue: weighing less than 600 grams, 20% lighter and 50% more compact than a standard 5.2 Ah battery pack Maximum power: powerful Li-HighPower cell technology for every application Durable: high current-resistant cells ensure a long service life Worry-free working: fully insured with Festool Service Automatic dust extraction: Bluetooth® version automatically starts a paired dust extractor when the tool is switched on AIRSTREAM function: suitable for all Festool 18 V cordless tools (except CXS, TXS, ETSC 125, RTSC 400, DTSC 400) Bluetooth® integration: pairing with CLEANTEC dust extractors for automatic start Technical dataWeight: 0.6 kg Capacity: 4.0 Ah Voltage: 18 V Standard deliveryFestool 18V 4.0 Ah Li-HighPower Bluetooth AIRSTREAM battery