The Festool SYS-MC 6/4 Rapid Charger for 18V Batteries (578501) is a multi-bay battery charger designed for anyone running more than one or two Festool cordless batteries and tired of a single-slot charger being the bottleneck. This is a battery charger designed for charging and transporting multiple Festool battery packs at once, whether that's in the workshop, in a service vehicle, or on the jobsite. It charges up to four Festool 10.8V to 18V battery packs at the same time, all from one standard outlet.

The headline number here is simultaneous charging, not sequential. Most chargers make you top off one battery, then swap in the next, then the next — this one runs all four bays at once, drawing on a maximum charging current of 6.0 amps and a total power draw of 700 watts. For a crew running two or three cordless tools through a workday, that's the difference between rotating batteries all afternoon and just topping everything off during lunch. LED indicators on each bay show charge status at a glance, so you can tell which packs are ready without guessing or pulling them to check.

Two integrated USB-C ports add a genuinely useful extra: they output anywhere from 5V/3A up to 20V/1.8A, enough to fast-charge a phone or tablet, so the charger works as a general power station on the bench and not just a battery box. Input runs on standard 100-240V power at 50-60Hz, so it's not picky about which outlet you plug it into.

Where this charger earns its place in a real workflow is how it fits into the rest of the Festool system. It's built to integrate with Systainers, and batteries remain accessible from all sides even when stacked, so you're not digging through a pile to find the one that's charged. It also mounts directly to a Festool Dust Extractor, which means the charger, your batteries, and your vacuum can travel and set up as one unit instead of three separate things you have to track down.

Compatibility covers the Festool 10.8V to 18V battery range broadly, with two specific exceptions: the BP-XS battery used for the CXS and TXS drills, and the BP Ergo battery line. If your batteries fall outside those two exceptions, they'll charge here. Note that batteries themselves are sold separately — this is the charger only, with a charging cable included.

Buy this if you're running two or more Festool 18V tools on a regular basis and battery swapping has become its own chore. It's a strong fit for shops, service vans, and busy jobsites where downtime waiting on a single charger costs more than the price of a faster one. If you're running just one tool with one or two batteries, a single-bay charger will cover you for less money — this one earns its keep once you're juggling a real battery fleet.

Stop Rationing Batteries — Charge All Four at Once

The Festool SYS-MC 6/4 Rapid Charger turns battery charging from a bottleneck into a non-issue by running four bays at the same time instead of making you wait in line.

• Who it's for: Crews and solo pros running multiple Festool 18V tools who are tired of shuffling one battery at a time through a single-slot charger.
• Why it stands out: True simultaneous four-bay charging, battery access from every side even when stacked, and USB-C ports that double as a phone charger — it's doing more than one job.
• Worth knowing: No batteries are included — this is the charger and a charging cable only, so budget for packs separately if you're starting from scratch.

• Does this charger come with batteries? No. It includes a charging cable only; Festool battery packs are sold separately.
• Which batteries won't work with this charger? The BP-XS battery used for the CXS/TXS drills and the BP Ergo battery line are not compatible. All other Festool 10.8V–18V packs are.
• Can I really charge four batteries at the same time? Yes — all four bays charge simultaneously from a single outlet, not one after another.
• Can I charge my phone on it too? Yes, two built-in USB-C ports output up to 20V/1.8A for charging phones, tablets, and other USB-C devices.