The Festool 18V Energy Set is a cordless battery and charger bundle designed for tradespeople running high-draw 18V tools through a full workday without stopping to wait on a charge. This is a battery and charging system built for continuous jobsite and shop power. The set packs four 8.0Ah TBX 8 tabless battery packs and two SCA 16 rapid chargers into a single Systainer SYS3 M 187, and it succeeds Festool item number 577328.

That replacement is a meaningful upgrade, not just a new part number. The previous Energy Set (577328) shipped with two standard-cell battery packs; this version pairs four of the newer 8.0Ah TBX Tabless battery packs with two SCA 16 rapid chargers, doubling the battery count and moving to tabless cell construction in the process. Tabless cells reduce internal resistance compared to standard-cell packs, which translates to more usable power and less heat buildup under sustained load — exactly the conditions a track saw or dust extractor creates during a long cutting session.

The charging side keeps pace with that extra capacity. Each SCA 16 charger runs at 16 amps and 18V input at 120V AC, and its AIRSTREAM active cooling system cools a battery pack during charging rather than just after, cutting recharge time to as little as 25 minutes. With two chargers and four batteries in rotation, you can keep two packs working while two more recharge, and never actually run out of power mid-job.

System intelligence carries over from the previous Energy Set unchanged: Bluetooth connectivity still auto-starts a paired CLEANTEC dust extractor the instant a connected tool is switched on, and the Festool app still gives you a live read on charge level, temperature, and usage history for each pack. This set works with all Festool 18V tools, with a short list of exceptions — the ETSC 125, RTSC 400, DTSC 400, and CTC SYS extractors use a different battery format and aren't compatible.

Everything ships together in a Systainer SYS3 M 187, so the whole kit stacks into your existing Systainer stack, travels as one unit, and stays organized instead of loose batteries rattling around a truck bed.

This Energy Set makes the most sense for contractors, cabinet shops, and remodeling crews running multiple 18V Festool tools — saws, sanders, and dust extractors — where downtime waiting on a battery costs real production time. If you're running one drill occasionally, this is more capacity than you need; if you're running a crew or a shop floor, it's built for exactly that load.

The Fix for "My Battery's Dead" Excuses

The Festool 18V Energy Set is the answer to running out of power on a crew that can't afford to stop.

• Who it's for: Contractors and shops running multiple high-draw 18V Festool tools — saws, sanders, extractors — back to back through a full day.
• Why it stands out: Four tabless 8.0Ah packs and two AIRSTREAM chargers means you're never more than 25 minutes from a full battery, and the jump from two batteries to four in the last-gen kit is a real capacity upgrade, not just a refresh.
• Worth knowing: Double-check your extractor model before you buy — the ETSC 125, RTSC 400, DTSC 400, and CTC SYS don't take these batteries.

• Will these batteries work with all my Festool 18V tools? Yes, with the exception of the ETSC 125, RTSC 400, DTSC 400, and CTC SYS dust extractors, which use a different battery format.
• How fast do the batteries recharge? The SCA 16's AIRSTREAM active cooling can bring a pack back to full in as little as 25 minutes.
• Can I monitor my batteries remotely? Yes. Bluetooth connectivity and the Festool app let you check charge level, temperature, and usage history for each pack.
• What did this Energy Set replace? It succeeds item number 577328, upgrading from two standard-cell battery packs to four of the newer 8.0Ah TBX Tabless packs.