Lithium Battery Fire Safety: What Every UK Household Needs to Know
Published May 2026
UK fire services are now responding to a lithium-ion battery fire once every five hours — nearly five incidents every single day. According to new research from insurer QBE, fire brigades attended 1,760 battery-related fires in 2025 alone, a staggering 147% increase compared to 2022. Five people have lost their lives to lithium-ion battery fires in the UK over the past three years.
These aren't fires confined to factories or warehouses. Almost half (46%) of all lithium-ion battery fires in 2025 started inside people's homes — in the same rooms where families sleep, eat, and live. If you own a smartphone, laptop, e-bike, e-scooter, electric toothbrush, vape, or toy, you have a lithium-ion battery in your home. This is a risk that affects almost everyone.
Why Are Lithium-Ion Battery Fires So Dangerous?
Lithium-ion batteries can fail through a process called thermal runaway — a self-sustaining chemical reaction triggered by impact damage, overcharging, overheating, or manufacturing defects. Once it begins, it is extremely difficult to stop.
What makes these fires uniquely hazardous:
- They spread with terrifying speed. Thermal runaway causes temperatures to escalate rapidly and can jump from cell to cell within a battery pack in seconds.
- They require enormous amounts of water to extinguish — up to ten times more than a conventional fire, according to QBE risk manager Adrian Simmonds.
- They can reignite. Even after appearing to be out, lithium-ion batteries can re-ignite hours later.
- They produce toxic gases. Burning lithium-ion cells release a cocktail of hazardous fumes that are dangerous to inhale.
Professor Guillermo Rein of Imperial College London has warned that lithium-ion battery fires “breach most of the layers of protection that we know,” describing the technology as an unintended new hazard that keeps him awake at night.
The Biggest Culprits
E-Bikes
E-bikes were linked to 520 fires in 2025 — more than triple the 149 recorded in 2022, and close to a third of all lithium-ion battery incidents nationally. Retrofitted e-bikes with aftermarket battery kits were involved in significantly more incidents than factory-built models with original battery packs. Cheap, uncertified replacement batteries are a major risk factor.
Electric Scooters
London firefighters now respond to an e-bike or e-scooter fire every other day — a frequency that officials describe as unthinkable just a few years ago.
Electric Vehicles
EV-related fires increased by 133% between 2022 and 2025, though it is worth noting that EV ownership tripled over the same period, meaning EVs are not disproportionately more dangerous per vehicle than before.
Everyday Devices
Smartphones, laptops, vapes, toys, and power banks are all potential sources of fire if the battery is damaged, counterfeit, or improperly charged.
How to Stay Safe: Practical Steps for Your Home
Charging Safety
- Never leave devices charging overnight or when you leave the house — most battery fires start while charging.
- Use only the official charger supplied with your device, or a certified replacement. Cheap third-party chargers are a leading cause of battery failure.
- Charge on hard, flat, non-flammable surfaces — never on beds, sofas, or carpets, which can trap heat and ignite if the battery fails.
- Stop charging once the battery is full. Prolonged overcharging degrades the battery and raises fire risk.
- Do not charge in hallways or near exits. If a fire breaks out, a burning battery in a hallway can block your only escape route.
Storage and Handling
- Inspect batteries and devices regularly for swelling, bulging, discolouration, or unusual heat — these are warning signs of a failing battery.
- Never use a visibly damaged battery. A cracked, swollen, or dented battery should be treated as a fire risk.
- Store e-bikes and e-scooters outside the home where possible, or in a garage — never in a hallway or living area.
- Keep batteries cool and dry. Avoid storing devices in direct sunlight or very hot environments.
Buying Safely
- Buy from reputable retailers and look for the UKCA or CE mark, which indicate the product meets recognised safety standards.
- Avoid cheap, unbranded batteries and chargers from unknown online sellers. Counterfeit and substandard products are a significant factor in fire incidents.
- Be cautious with second-hand e-bikes. Retrofitted models with aftermarket batteries carry a much higher fire risk than certified factory models.
Disposal
- Never put lithium-ion batteries in your household bin or recycling bin. Batteries crushed in refuse vehicles are a major cause of fires in waste trucks — the sector reports an average of 15 vehicle fires per month.
- Take old batteries to a designated battery recycling point. Many supermarkets, DIY stores, and council recycling centres accept them.
What to Do If a Battery Catches Fire
- Get everyone out immediately. Do not attempt to move a burning battery — toxic gases and the risk of explosion make this extremely dangerous.
- Call 999. Do not assume a small fire will stay small. Lithium-ion fires escalate with extraordinary speed.
- Close doors behind you to slow the spread of fire and smoke.
- Do not re-enter the building under any circumstances.
- Tell firefighters it is a lithium-ion battery fire so they can bring the right equipment and quantity of water.
The Bigger Picture
Industry bodies estimate the financial cost of lithium-ion battery fires in the UK now exceeds £1 billion annually, not including the human cost of five deaths and many more injuries over the past three years.
Fire chiefs and safety experts are calling for stronger regulation — including restrictions on counterfeit and substandard batteries — but in the meantime, the most powerful protection available is public awareness.
Lithium-ion batteries are a remarkable technology that power our modern lives. Used carefully and responsibly, they are safe. The dramatic rise in fires is driven not by the technology itself, but by damaged batteries, poor-quality chargers, unsafe charging habits, and uncertified products entering the market.
A few simple changes to how you charge, store, and dispose of batteries could genuinely save your life.
Email Whale Fire today @ info@whalefire.co.uk or call us on 0800 772 0738
