Festool 578946 Energy Set SYS 18V 4xTBX4/TCL6DUO is a powerful, ready-to-go solution designed to expand your cordless system or equip Festool Basic tools with premium power from day one. This set features Festool’s latest TBX tabless battery technology, delivering high output, fast charging, and smart system integration, making it i for demanding jobsite and shop applications. Included are four BP 18 TBX 4.0 Ah tabless batteries, providing ample runtime to keep multiple tools working throughout the day. The TCL 6 DUO rapid charger charges two batteries simultaneously, reducing downtime and eliminating the need for multiple chargers or additional outlets—especially valuable on busy jobsites or in mobile setups. All components are neatly organized and protected in a SYS3 M 187 Systainer, ensuring easy transport, storage, and seamless integration into the Festool Systainer system. Whether you’re building out a cordless platform or adding capacity to an existing setup, this Energy Set delivers efficient power management, faster workflows, and dependable performance, fully backed by Festool Service for long-term confidence. Model Number: 578946