Lithium Battery Fires – The Risks, Extinguishers, and Why Evacuation Is Critical

E-Scooter Fire

Lithium-ion batteries are now part of everyday life. From e-bikes and power tools to mobile phones and energy storage systems, their use is widespread across homes and businesses.

However, with this increased use comes a growing and significant fire risk that is not always fully understood.

What Makes Lithium Battery Fires Different?

Lithium-ion battery fires are fundamentally different from traditional fires. They are driven by a process known as thermal runaway which is a chain reaction within the battery that causes it to rapidly overheat, release flammable gases, and potentially explode.

Once thermal runaway begins:

• The fire can intensify very quickly

• It can reignite after appearing extinguished

• It produces toxic and highly flammable gases

• It may involve violent rupture or explosion

This makes lithium battery fires unpredictable and extremely dangerous.

Are There Fire Extinguishers for Lithium Batteries?

Yes, specialist extinguishers have been developed specifically for lithium-ion battery risks.

These are often:

• Water-based, sometimes with additives

• Designed to cool the battery cells

• Intended to slow or control thermal runaway

You may see these labelled as:

• “Lithium-ion extinguishers”

• “Battery fire extinguishers”

• Sometimes informally as “Class L”

It’s important to understand that under BS EN 2, there is currently no official fire class for lithium-ion batteries, despite these labels being used in the industry.

The Hidden Danger – Expecting Staff to Tackle These Fires

A growing concern is the expectation placed on staff or occupants to use extinguishers on lithium battery fires.

This presents serious risks:

• Rapid escalation can trap individuals before they can escape

• Explosive failure of battery cells can cause injury

• Toxic smoke poses immediate health hazards

• Fires can reignite even after being tackled

Unlike a typical small fire, lithium battery incidents can become life-threatening within seconds.

The Key Safety Message: Evacuate, Don’t Fight

In most cases, the safest and most appropriate response to a lithium-ion battery fire is:

Raise the alarm and evacuate immediately. Do not attempt to fight the fire.

mobile phone on fire

Fire extinguishers may have a role:

• In very early-stage incidents

• By trained individuals

• Where a safe escape route is maintained

However, they should never replace the priority of getting people to safety.

What This Means for Businesses

Responsible fire safety management should include:

• Identifying lithium battery risks (e-bikes, charging areas, storage)

• Implementing safe charging practices

• Providing appropriate fire detection and warning systems

• Considering specialist extinguishers where appropriate

• Training staff on the limitations and dangers of tackling these fires

Most importantly:

• Ensuring staff understand that their safety comes first

Final Thoughts

Lithium-ion battery fires are an evolving risk, and while extinguisher technology is improving, they remain highly hazardous and unpredictable.

No piece of equipment should give a false sense of security.

The priority is always life safety — not firefighting.

If a lithium battery fire occurs, the safest action is clear:

Evacuate immediately and call the fire service.

If you would like advice on assessing lithium battery risks within your premises, or guidance on appropriate fire safety measures, feel free to get in touch