The compact one: full power with low weight. With tabless cell technology. Special Features:Work without fatigue: 4.0 Ah for full power with a weight of only 600g Full power: Tabless cell technology delivers maximum power, even in demanding applications Long service life: The low heat generation of the tabless cells extends the battery life Hot or cold: Tabless batteries are reliably ready for use, even at extreme temperatures Shorter charging cycles: Batteries can be charged immediately after use thanks to low heat generation Lightning-fast charging: ready for use again in 25 minutes thanks to the AIRSTREAM rapid charger SCA 16. This is made possible by active cooling during charging Practical: LED indicator always shows the current charge status of the battery Secure: A soft soft-grip exterior for protection and a firm grip of the machine on slanted surfaces Comfortable: thanks to Bluetooth®, the CLEANTEC mobile dust extractor can be automatically started when the cordless machine is switched on (Festool dust extractor must be equipped with Bluetooth®) Smartly expanded: In combination with the Bluetooth® function of the battery, the Festool App enables smart additional functions, e.g. the detailed display of the charge status and other operating data such as temperature or charging cycles For a carefree workday: of course, the batteries are also fully insured with Festool SERVICE Bluetooth® lithium-ion (Li-Ion) battery with tabless cell technology and AIRSTREAM function Technical data:Capacity 4.0 Ah Voltage (nominal voltage) 18 V