The Festool Energy Set 18V 2xTBX4/TCL6 is an 18-volt battery and charger starter set for Festool cordless tools. This is a cordless battery starter set designed for powering Festool 18V tools across a wide range of jobsite and workshop applications. Model number 578731. If you are buying into the Festool cordless platform or need extra runtime on hand, this set gives you two battery packs and a matching charger in one straightforward package.

What makes this set worth looking at is the balance of output and weight. Festool describes it as built for maximum power while staying lightweight, which is exactly what most users want from a daily-use cordless setup. In practical terms, that means you are not choosing between strong performance and manageable tool handling. For overhead work, repetitive cuts, fastening, or general service work, lighter battery packs can make a noticeable difference by the end of the day.

The two included battery packs are TBX4 tabless units. The tabless battery design matters because it is aimed at delivering power efficiently while helping keep the pack compact and easier to carry on the tool. For users running a cordless saw, drill, impact driver, or other 18V Festool platform tool, spare batteries are not just a convenience. They keep the work moving when one pack is in the tool and the other is on the charger.

The included TCL 6 charger rounds this set out as a real working kit instead of just a pair of spare batteries. That is useful for new platform users who need a charger from day one, and for existing Festool users who want a second charging station in the trailer, van, or shop. A second charger setup can save time when multiple tools are in rotation or when several crew members are working from the same battery platform.

Compatibility is one of the biggest reasons to buy this set. Festool positions the Festool Energy Set 18V 2xTBX4/TCL6 for all applications and 18-volt devices, with specific exceptions for the ETSC 125, RTSC 400, and DTSC 400. That broad fit makes it a practical platform purchase rather than a narrow accessory. If you already run Festool cordless tools, this kind of set gives you flexibility across the system instead of tying your money up in a single-tool battery solution.

Who should buy it? This set makes the most sense for Festool users who want more runtime, less downtime, and a cleaner way to expand into the 18V cordless platform. It is a strong fit for carpenters, installers, remodelers, cabinet crews, service pros, and serious DIY users who already know that one battery is never enough once the work starts. If you need dependable backup power and a dedicated charger without overcomplicating the purchase, this is the simple answer.

One of the cleanest ways to get into Festool 18V power

The Festool Energy Set 18V 2xTBX4/TCL6 is the kind of buy that makes more sense the more cordless tools you use.

• Who it's for: Festool users building out an 18V cordless setup or adding battery capacity for longer work sessions.
• Why it stands out: You get two tabless battery packs plus the TCL 6 charger, so it is not just spare batteries, it is a real working power solution.
• Worth knowing: Compatibility is broad across the Festool 18V system, but there are specific exceptions, so double-check if you are shopping for the ETSC 125, RTSC 400, or DTSC 400.

• What kind of product is this? This is an 18V battery and charger starter set for Festool cordless tools.
• Is this made for the Festool 18V platform? Yes. Festool positions it for 18-volt devices and applications within the Festool cordless system.
• Are there any known compatibility exceptions? Yes. Festool notes exceptions for the ETSC 125, RTSC 400, and DTSC 400.