SCA 8 features Festool’s AIRSTREAM Technology allowing for rapid charging of compatible batteries. AIRSTREAM technology significantly increases the battery capacity and provides faster charging. Cool air is directed through targeted air ducts in the battery and out through the charger to quickly lower the internal temperature. Theminute display informs the user when the charging battery can be used again, meaning less guessing games and increased productivity. Fast charging in 30-40 minutes. For use with Festool Lithium-ion batteries.