Lithium-Ion Fire Suppression: The Operational Question Matters More Than the Product Claim
Recent discussion following the Fire Safety Research Institute’s full-scale electric vehicle fire research has created a new debate around suppression agents.
One claim appearing frequently is that the research proved that “compounds do not work on lithium-ion battery fires.”
That conclusion may go too far or at the very least confuse.
The more useful lesson for fire services, industry, recyclers, towing and recovery operators, and other organizations dealing with lithium-ion incidents is that we need to stop treating every battery event as a single fire requiring a single solution.
One Test Does Not Define an Entire Category
Full-scale EV testing provides valuable evidence about what happens under specific conditions.
But testing one agent, one application method, one vehicle configuration or one battery scale cannot establish how every suppression product will perform in every lithium-ion incident.
The reverse is also true.
A product that performs successfully during a smaller battery test does not automatically prove that it can control or extinguish a full electric-vehicle traction battery.
Scale matters.
A small consumer battery, an e-bike battery, a damaged EV pack, a pallet of lithium-ion batteries and a stationary energy-storage system are very different hazards.
The question therefore should not simply be:
“Does this product work on lithium-ion batteries?”
A much better operational question is:
“What does this product accomplish, under what conditions, at what scale, and at what stage of the incident?”
Extinguishment Is Only One Possible Objective
One of the biggest problems in lithium-ion fire discussions is the tendency to describe suppression products as either successful or unsuccessful based solely on whether they completely extinguish the battery.
That is not always how responders should evaluate operational value.
Depending on the incident, the objective may be to:
- Knock down visible fire
- Reduce heat
- Protect nearby exposures
- Slow or limit propagation to additional cells
- Prevent fire spread to a structure or vehicle
- Create safer working conditions for responders
- Control an exterior fire while the battery remains in thermal runaway
- Reduce the likelihood of subsequent ignition
- Stabilize the scene for recovery and transport
A product may provide value in one of these areas without stopping the internal chemical reaction occurring inside a damaged battery cell.
That distinction is critical.
There May Be More Than One Fire Problem
Lithium-ion incidents can involve several different problems occurring at the same time or in sequence.
The first may be the external fire — flames involving seats, plastics, tires, cargo, building materials or surrounding combustibles.
The second is the battery’s internal thermal event — heat generation, cell failure and possible propagation through the battery pack.
Then comes the problem responders cannot ignore: residual energy.
Even after visible flames disappear, damaged cells may remain energized, continue producing heat, off-gas or reignite.
Finally, the incident moves into another operational stage:
recovery, transportation and storage.
At that point the challenge may no longer belong primarily to the fire department. It may involve towing companies, salvage yards, insurers, waste operators, property owners and dangerous-goods transportation personnel.
These are different problems occurring on different timelines.
It is unlikely that one product or one tactic will solve all of them.
A Better Way to Evaluate Lithium-Ion Suppression Products
CESAT believes organizations considering lithium-ion suppression products should evaluate them against the specific operational problem they are intended to solve.
Questions should include:
Visible Fire
How effectively does the product suppress flames involving the battery or surrounding materials?
Cooling
How much does it reduce battery and surrounding temperatures, and for how long?
Propagation
Does testing demonstrate that it can slow or prevent failure from spreading between cells or modules?
Exposure Protection
Can it protect nearby vehicles, structures, equipment or battery systems?
Re-Ignition
How long was the test monitored after application, and was subsequent ignition observed?
Application Requirements
How much agent is required? How is it applied? Can firefighters realistically deliver it under operational conditions?
Scale
Was the product tested on individual cells, small battery packs, e-bike batteries, EV modules or a complete vehicle battery?
Environment and Cleanup
What happens to the agent and contaminated runoff after use?
Recovery
Does the product create advantages or additional challenges when the battery must later be moved, transported or stored?
Without those answers, broad statements such as “works on lithium-ion batteries” provide very little useful information to a procurement officer or incident commander.
Avoiding Both Extremes
The lithium-ion safety industry needs to avoid two equally unhelpful positions.
The first is:
“We found the solution.”
There is currently no single tool, suppression agent or tactic that solves every lithium-ion incident across every battery size and application.
The second is:
“Nothing works.”
That conclusion can be just as misleading.
Different tools may provide different operational benefits depending on the hazard and the objective.
Water may remain an important cooling and exposure-protection tool in many large battery incidents. Specialized agents may have roles in smaller battery applications, initial suppression, containment, exposure protection or particular industrial environments.
Fire blankets, containment systems, cooling devices and other technologies may also provide value — but only when their limitations are understood.
The goal should not be to find a universal winner.
The goal should be to understand where each tool fits within an incident strategy.
Independent Testing Matters
This is also why CESAT believes governments, fire services and industry should demand independent, scenario-specific evidence before purchasing lithium-ion safety products.
Testing should clearly identify:
- Battery chemistry
- Battery capacity
- State of charge
- Battery configuration
- Failure method
- Suppression method
- Application rate
- Temperature change
- Propagation behaviour
- Re-ignition monitoring period
- Environmental considerations
- Operational limitations
A successful 600 Wh test should be presented as evidence of performance at approximately that scale.
It should not automatically become a claim about a 75 kWh EV battery.
Likewise, the result of a full-scale EV experiment should not automatically become a verdict on every agent designed for smaller battery hazards.
Evidence needs context.
The Operational Question
Lithium-ion incidents should ultimately be approached as a sequence of operational problems:
Fire → Thermal Runaway → Propagation → Exposure → Residual Energy → Recovery → Transport → Storage
At every stage, responders should ask:
What problem are we trying to solve right now?
Once that question is clear, the appropriate tactic, equipment and suppression method can be evaluated against that objective.
That is a far more useful approach than asking whether one compound, extinguisher or technology can “put out a lithium-ion battery fire.”
For CESAT members, this is the key takeaway:
Do not evaluate lithium-ion products by marketing claims alone. Evaluate the operational outcome they can demonstrably produce — at the battery scale and under the conditions in which you intend to use them.
That distinction can make the difference between purchasing a product and building an actual response capability.