The Festool 577324 BP 18 Li 8,0 HP-ASI High Power 8.0Ah Battery Pack is a high-capacity 18V lithium-ion battery pack built for demanding cordless tool use. This is a battery pack designed for heavy-duty applications that need both long runtime and strong output. Model Number 577324. If you are running power-hungry Festool cordless tools and do not want to keep stopping for a battery change, this is the pack meant for that job.

The big story here is capacity and endurance. Festool rates this pack at 8.0Ah and says it delivers 54% longer runtime than a 5.0Ah standard battery pack. That matters on real work, especially with tools that pull harder under load like cordless saws, grinders, and extractors. Instead of building your day around battery swaps, you get a longer working window from each charge.

Festool also built this battery around its EC-TEC brushless tool platform. According to Festool, the pack is tailored to brushless Festool EC-TEC motors for high efficiency and strong output per charge. In plain terms, the battery is not just bigger, it is intended to work as part of the full tool system so your cordless setup performs the way it should under demanding use.

Charging speed is another reason this pack stands out. Large batteries are useful only if they get back into service quickly, and this one is designed around Festool AIRSTREAM charging technology. Used with the SCA 16 AIRSTREAM rapid charger, the battery is actively cooled before and during charging and can be ready to use again in as little as 27 minutes. That is a practical advantage for crews rotating packs through high-draw tools through the day.

Festool did not ignore jobsite durability either. The battery uses high current resistant cells for durability, and the housing includes an all-round high-impact frame made from soft-grip material. That gives the pack more protection when it is set down, moved around the site, or used on uneven and inclined surfaces. The built-in LED charge indicator also lets you check battery status fast without guessing how much work you have left.

Where this battery pack becomes more than just a power source is connectivity. Built-in Bluetooth lets a compatible Festool CLEANTEC mobile dust extractor start automatically when the cordless tool is turned on. It also works with the Festool app to show charge status and operating data such as temperature and charge cycles. For users already invested in Festool cordless tools and dust extraction, that system benefit is a real time-saver, not just a tech feature for the sake of it.

Compatibility is broad, but not universal. Festool states this battery is suitable for all Festool 18V applications and tools for maximum power and endurance, except ETSC 125, RTSC 400, DTSC 400, and CTC SYS. That makes it a strong fit for users who want one of the highest-capacity options in the Festool 18V battery platform, especially for tools with very high power needs such as the HKC 55, AGC 18, and CTC MIDI cordless extractors named by Festool.

Who should buy it? Contractors, remodelers, carpenters, and serious Festool users who already run 18V cordless tools and want fewer battery changes, strong sustained output, and fast turnaround on the charger. If your work is light-duty and compact-tool focused, this much battery may be more than you need. If your tools work hard and your day is measured by uptime, this is the battery pack that makes sense.

Festool 577324 BP 18 Li 8,0 HP-ASI High Power 8.0Ah Battery Pack for Users Who Actually Work Their Cordless Tools

This is the Festool battery pack you buy when uptime matters more than shaving a little weight off the tool.

• Who it's for: Festool users running demanding 18V cordless tools, especially saws, grinders, and extractors that burn through smaller packs.
• Why it stands out: You get real 8.0Ah capacity, fast AIRSTREAM charging, Bluetooth dust extractor integration, and broad compatibility across the Festool 18V platform.
• Worth knowing: This is a high-capacity pack, so the payoff is biggest on heavy-draw tools. If you mainly use compact sanders or lighter-duty tools, the extra runtime may be more than you need.

• What type of product is this? It is an 18V lithium-ion battery pack with Bluetooth and AIRSTREAM charging support for Festool cordless tools.
• How much capacity does it have? This battery pack is rated at 8.0Ah.
• Is it compatible with every Festool 18V tool? Festool says it is suitable for all 18V applications and tools for maximum power and endurance except ETSC 125, RTSC 400, DTSC 400, and CTC SYS.
• Can it work with Festool dust extractors? Yes. Built-in Bluetooth can auto-start a compatible Festool CLEANTEC mobile dust extractor when the cordless tool is switched on.
• How fast does it charge? Festool states it can be ready to use again in as little as 27 minutes when used with the SCA 16 AIRSTREAM rapid charger.