Key Features
Four 4.0Ah PacksThis Festool Dual 4.0Ah Battery & Charger Energy Systainer Set plus 18V Airstream Bluetooth 4.0Ah Battery 2-Pack gives you four 18V 4.0Ah batteries total, so you can keep more tools working and spend less time waiting on a charge. Dual-Port ChargingThe included TCL 6 DUO rapid charger charges two batteries in one spot, which makes battery rotation simpler on the bench or on the jobsite. Bluetooth Dust ControlThe extra Bluetooth AIRSTREAM batteries can automatically start a compatible Festool CLEANTEC mobile dust extractor when the cordless tool is switched on, which saves a step and keeps dust control tied to the tool.
Overview
The Festool Dual 4.0Ah Battery & Charger Energy Systainer Set plus 18V Airstream Bluetooth 4.0Ah Battery 2-Pack is a Festool 18V battery and charger combo kit built for users who need more runtime, faster battery rotation, and cleaner storage in one buy. This is a battery and charger combo kit designed for powering and rotating Festool 18V cordless tools. Variant SKU: 4.0AH Battery Charger Set 4 pack.
What matters here is the setup: you are getting four total 18V 4.0Ah battery packs, plus the TCL 6 DUO rapid charger and a SYS3 M 187 Systainer. That gives you enough batteries to run multiple tools through the day or keep one main tool working while the next pack is already charging. If you already own Festool Basic cordless tools, this is the kind of package that fills in the power side fast without piecing everything together one battery at a time.
The included Energy Set portion centers on the dual-port charger. A dual charger is not just a convenience feature. On a real jobsite or in a busy shop, it means you can keep two packs cycling from one outlet and one station instead of spreading chargers across the bench. Paired with the Systainer, it also gives you a cleaner way to store, transport, and stack your power setup with the rest of your Festool system.
The added Bluetooth 18V AIRSTREAM 4.0Ah HighPower Compact batteries bring another practical advantage. Festool calls out that these packs are lighter and more compact than a 5.2Ah battery, which matters when the tool is in your hands all day. Less battery bulk can make overhead work, repeated starts and stops, and detail work feel less tiring, while still keeping enough output for most 18V tool use.
There is also a real dust-control benefit if you are already in the Festool system. The Bluetooth battery can automatically start a compatible Festool CLEANTEC mobile dust extractor when the cordless tool is switched on. That is useful for indoor finish work, punch-list jobs, and service work where dust management is part of the job, not an afterthought. You do need a Bluetooth-compatible extractor for that function, so it is a system advantage, not a universal feature.
Compatibility is broad, but not unlimited. Festool states these batteries are for all Festool 18V cordless tools with specific exceptions. They are not compatible with ETSC 125, RTSC 400, DTSC 400, CXS, TXS, the dust extractor CTC SYS, and the TSC 55 cordless track saw. That is worth checking before you buy, especially if your lineup leans toward compact specialty tools or selected sanding and track saw platforms.
Who should buy this? Festool users who already own several 18V cordless tools, crews that want a dedicated battery charging station in a Systainer, and anyone tired of moving a couple of packs from tool to tool. If you only need one replacement battery, this is more than you need. If you want a proper Festool 18V power setup with charger, storage, and enough battery inventory to actually keep working, this is the smarter package.
More Batteries, Less Downtime
This package is built around battery rotation. Four 4.0Ah packs means you can keep working longer between full recharge cycles and keep more than one cordless tool ready to go.
- Includes four total 18V 4.0Ah battery packs
- Good fit for workshop backup power and jobsite battery rotation
One Charging Station That Travels Cleanly
The SYS3 M 187 Systainer turns the charger and battery setup into a single grab-and-go station. That matters if your tools move between van, shop, and punch-list work instead of staying in one place.
- Includes the TCL 6 DUO rapid charger
- Includes a SYS3 M 187 Systainer for storage and transport
Bluetooth Batteries Add System Value
The Bluetooth AIRSTREAM packs do more than store power. In the right Festool setup, they help automate dust extraction, which is a real upgrade for indoor work where cleanup and air control matter.
- Bluetooth can start a compatible Festool CLEANTEC mobile dust extractor automatically
- Compact 4.0Ah pack is lighter and smaller than a 5.2Ah battery according to Festool
What’s in the Box
- (4) Festool 18V 4.0Ah battery packs total
- (1) Festool TCL 6 DUO rapid charger
- (1) Festool SYS3 M 187 Systainer
Key Specifications
| Voltage (V) | 18 V |
|---|---|
| Battery Capacity (Ah) | 4.0 Ah |
| Battery Quantity | 4 packs |
| Charger Included | TCL 6 DUO rapid charger |
| Charging Ports | 2 |
| Case Included | SYS3 M 187 Systainer |
| Battery Type | Li-HighPower Compact lithium-ion with AIRSTREAM |
| Weight (lbs) | 16.6 lbs |
Compatibility
Battery PlatformDesigned for Festool 18V cordless tools. Dust Extractor ConnectivityBluetooth batteries can automatically start a compatible Festool CLEANTEC mobile dust extractor when the cordless tool is switched on. Not Compatible WithFestool lists these exceptions: CXS, TXS, ETSC 125, RTSC 400, DTSC 400, CTC SYS, and TSC 55.
Built For
Festool 18V Cordless Users Workshop Backup Power Jobsite Battery Rotation Service Work Indoor Dust-Control Setups General Contracting
Pro Tip
If you are building out a Festool cordless setup, keep the TCL 6 DUO and all four packs in the Systainer as one dedicated charging station. It sounds simple, but having batteries, charger, and storage in one stackable case saves a lot of hunting around at the end of the day.
Tool Nut’s Take
Tool Nut’s Take
Festool Dual 4.0Ah Battery & Charger Energy Systainer Set plus 18V Airstream Bluetooth 4.0Ah Battery 2-Pack for Serious 18V Users
This is the kind of Festool power setup that makes more sense the more cordless tools you own.
- Who it’s for: Festool users running multiple 18V tools in the shop or on the job and anyone who wants a real battery rotation system instead of buying single packs one at a time.
- Why it stands out: Four 4.0Ah batteries, a true dual-port rapid charger, Systainer storage, and Bluetooth dust extractor control give this kit more everyday value than a basic charger-and-two-battery bundle.
- Worth knowing: Compatibility is broad but not universal, so check the excluded tools before you buy, especially if you use compact drills, hybrid sanders, or the TSC 55.
Common Questions
- What voltage platform is this for? This combo is for Festool 18V cordless tools.
- How many batteries are included total? The package includes four 18V 4.0Ah battery packs total.
- Does the Bluetooth feature work with any dust extractor? No. Festool states the Bluetooth battery can automatically start a compatible Festool CLEANTEC mobile dust extractor.
- Are these batteries compatible with every Festool 18V tool? No. Festool lists exceptions including CXS, TXS, ETSC 125, RTSC 400, DTSC 400, CTC SYS, and TSC 55.
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