Why Is EN 3-11 Important?
For many years, the fire industry has relied on standards designed around traditional fire classes such as combustible materials, flammable liquids and electrical equipment. However, lithium-ion battery fires behave differently.
Thermal runaway events can generate intense heat, toxic gases and the potential for re-ignition long after visible flames have been extinguished. As battery-powered devices become more widespread, dedicated testing methods are needed to assess how fire extinguishers perform against these unique hazards.
EN 3-11 is the first European standard specifically focused on portable extinguishers for lithium-ion battery fires, providing a structured testing methodology and certification pathway while complementing the existing requirements of EN 3-7 rather than replacing them.
What Does the Standard Cover?
The proposed standard focuses on smaller lithium-ion battery risks up to 600Wh and provides a test method to verify whether a particular fire extinguisher can successfully suppress a lithium-ion battery fire, including:
- Smartphones
- Laptops
- Power tools
- Household appliances
- Medical devices
- Drones
- E-bikes
Importantly, the standard does not currently cover larger battery systems such as electric vehicles, forklifts or stationary energy storage systems.
What Does an EN 3-11 Approved Extinguisher Need to Demonstrate?
To achieve EN 3-11 approval, an extinguisher must successfully complete a defined lithium-ion battery fire test designed to assess both extinguishing performance and resistance to re-ignition. During testing, extinguishing must begin as soon as the first visible flame appears from the battery pack, with a maximum of three minutes allowed to suppress the fire. Following extinguishment, the battery is monitored for a 20-minute observation period to assess whether re-ignition occurs, reflecting the unique challenges associated with lithium-ion battery fires.
The standard also includes strict performance requirements to ensure results are consistent and repeatable. To achieve certification, extinguishers must successfully pass multiple test repetitions rather than relying on a single successful outcome. Once approved, extinguishers are assigned a fire rating format, such as "600Wh Li", indicating the battery capacity they have been tested against and their lithium-ion classification. Manufacturers must also provide supporting technical documentation as part of the certification process, ensuring products undergo a comprehensive evaluation rather than a simple performance test.
Marking and Labelling Requirements
Achieving EN 3-11 certification is not only about passing the fire performance tests. Once an extinguisher has been successfully classified, manufacturers and suppliers must ensure that the product is clearly marked to demonstrate its certification status and provide important safety information to end users. These marking requirements place a strong emphasis on user awareness and training.
The extinguisher marking must include:
- The reference of the certification or test institute that conducted the approval testing.
- The certification number associated with the EN 3-11 approval.
- The lithium-ion battery classification and rating, such as "600Wh Li".
- The mandatory warning statement:
"Li-ion battery fire is extremely dangerous; training is advised."
What Can We Learn From EN 3-11?
Perhaps the most valuable takeaway is not the standard itself, but what it tells us about the industry's evolving understanding of lithium-ion fire risks.
The testing protocol focuses on:
- Fire suppression effectiveness
- Prevention of re-ignition
- Consistent and repeatable testing methods
- Product certification and traceability
- User awareness and training requirements
The inclusion of re-ignition prevention as part of the testing process reflects a growing recognition that successfully extinguishing visible flames is only one part of managing a lithium-ion battery incident.
The Industry Is Still Learning
One of the challenges facing the fire protection sector is that lithium-ion technology continues to evolve rapidly.
EN 3-11 should therefore be viewed as an important milestone rather than a final destination. It represents the latest step in a broader journey toward better understanding, testing and mitigating lithium-ion battery fire risks.
Looking Ahead
At Li-ion Fire Solution, we closely monitor developments such as EN 3-11 because they contribute to the growing body of knowledge surrounding lithium-ion fire protection. Standards like these help create greater consistency across the industry, providing clearer benchmarks for testing and performance while supporting the development of more effective fire suppression solutions.