Lithium-ion battery fires: what installers need to know 

Modern homes are packed with more battery-powered devices than ever before. From e-scooters and bikes to tablets, cordless tools and smart home gadgets, lithium-ion batteries are at the heart of this growing trend. But while they offer convenience and flexibility, these batteries also pose a significant, and growing, fire risk. Jay Singhera, Fire & Rescue Services Account Manager at FireAngel, explores how installers can help mitigate the danger.

UK Fire and Rescue Services have identified lithium-ion battery fires as one of the fastest-rising causes of domestic callouts. Data shows a 46% increase in lithium-ion battery-related fires in 2023 compared to 2022 (britsafe.org), underlining how important it is for safety standards and detection systems to keep pace. For installers, this is a critical moment to assess whether the systems being installed are equipped to deal with these modern risks.

Understanding the unique nature of lithium-ion fires

Fires involving lithium-ion batteries behave very differently from more familiar types of domestic fires. They can erupt suddenly, reach extremely high temperatures in seconds, and emit toxic gases. Unlike traditional fires, there’s often no slow build-up of smoke or heat – just a sudden onset of flames caused by a process known as thermal runaway, which is a chain reaction that occurs within a lithium-ion battery when it becomes mechanically damaged, electrically overcharged, or subjected to elevated ambient temperatures.

Fires are likely to start during charging, especially with non-genuine or damaged chargers, and tend to occur in locations like bedrooms, hallways or garages. These areas are often out of sight or used during nighttime hours, making early detection even more crucial.

Installing smarter fire safety solutions

To counter this threat, it’s essential that detection systems are specified with these modern fire risks in mind. Heat alarms, in addition to traditional smoke alarms, should be considered in rooms where charging commonly happens, such as utility spaces, garages and bedrooms.

Interlinked alarms offer another layer of protection. If a fire breaks out in a remote part of the home, an interconnected system ensures the alarm sounds across all areas, giving everyone more time to react. This is especially important in larger homes or multi-occupancy properties, where a single alarm might go unnoticed. For retrofit projects or where wiring isn’t practical, battery-powered interlinked alarms provide an easy-to-fit and cost-effective solution.

Combining technology with awareness

While upgrading alarm systems is an important step, it’s equally vital to combine this with education. Installers and contractors have a key role to play in highlighting safe usage and charging practices to occupants, particularly in properties where vulnerable individuals live. Simple messages such as avoiding overnight charging, using only manufacturer-approved chargers, and not charging devices on soft furnishings can go a long way towards preventing serious incidents.

Where budgets and infrastructure allow, connected systems that enable remote monitoring are increasingly being explored by landlords and housing providers. These technologies can flag alarm faults, low battery warnings or even activation alerts in real-time, making them particularly valuable in homes occupied by people at higher risk, such as the elderly, those with mobility issues or tenants with additional support needs.

Staying ahead in a changing market

The risk of battery fires is expected to keep rising as more devices, and transport options, rely on lithium-ion power. For installers, this means staying informed not only about fire safety regulations but also about the evolving technologies that can improve early warning and response.

Installers aren’t just fitting alarms; they’re shaping safer homes. By combining expert product selection with smart installation choices and clear advice to residents, they can play a frontline role in preventing battery-related incidents and saving lives.

fireangel.co.uk/trade

This article appeared in Electrotechnical News November/December 2025 edition – read it here