From e-bikes to grid-scale storage, lithium-ion batteries present unique fire risks that traditional fire safety strategies don't address. Here's what building owners need to know.. A New Category of Fire Risk The proliferation of lithium ion battery technology across every sector of UK life has introduced a fire risk that the existing regulatory framework was never designed to address. From e bikes and e scooters stored in residential corridors to grid scale Battery Energy Storage Systems (BESS) adjacent to commercial buildings, the scale and severity of this emerging threat demands urgent attention. London Fire Brigade responded to 155 e bike and e scooter fires in 2023 alone — a figure that has been doubling annually. Nationally, lithium ion battery fires now represent the fastest growing category of fire incident. Why Lithium Ion Fires Are Different Lithium ion battery fires exhibit characteristics that make them fundamentally different from conventional fires: Thermal Runaway Once a lithium ion cell enters thermal runaway, the exothermic reaction is self sustaining. The cell generates its own oxygen, meaning: Water suppression is less effective — the reaction continues underwater Re ignition is common — batteries can reignite hours or days after apparent extinguishment Toxic gases — hydrogen fluoride, phosphorus pentafluoride, and other highly toxic gases are released Unpredictable Ignition Battery fires can initiate from: Manufacturing defects (internal short circuits) Physical damage (dropped, crushed, punctured) Overcharging or use of incompatible chargers Exposure to heat or direct sunlight Age related degradation No apparent cause (spontaneous thermal runaway) The Regulatory Gap Current UK fire safety legislation was developed before lithium ion batteries became ubiquitous: Regulatory Reform (Fire Safety) Order 2005 — Does not specifically address battery storage risks Building Regulations Approved Document B — No specific guidance on battery storage or charging areas BS 9991/BS 9999 — Limited guidance on lithium ion battery risks However, the Responsible Person's duty to conduct a 'suitable and sufficient' fire risk assessment means these risks must be identified and managed regardless of specific regulatory guidance. Residential Buildings: The Frontline Residential buildings face the most acute lithium ion battery risks: Common Areas E bikes and e scooters stored in communal hallways and escape routes Charging stations in basement car parks Delivery robots and drones in purpose built to rent schemes Individual Dwellings Multiple devices charging simultaneously Use of counterfeit or incompatible chargers Modified or 'second life' batteries No smoke detection in charging areas Management Responses Building managers are increasingly implementing: Bans on e bike/e scooter storage in common areas Dedicated external charging compounds with fire suppression Enhanced smoke detection with specific battery fire signatures Resident education programmes Commercial and Industrial Considerations Battery Energy Storage Systems (BESS) Grid scale battery storage presents significant fire risks: Separation distances from occupied buildings Fire suppression system design (water mist, aerosol, gas) Explosion risk from off gassing Environmental contamination from runoff Emergency response planning Warehouses and Distribution Large quantities of lithium ion products in storage Charging areas for electric forklifts and AGVs Last mile delivery vehicle charging Data Centres UPS battery systems transitioning from lead acid to lithium ion Higher energy density = higher fire risk per unit area Critical need for early detection and rapid suppression Fire Engineering Solutions Effective management of lithium ion battery fire risks requires a multi layered approach: Early detection — Aspirating smoke detection, gas detection (for off gassing), thermal imaging Suppression — Water mist systems, continuous cooling capability, containment Ventilation — Smoke and toxic gas extraction, explosion relief Separation — Physical isolation of charging/storage areas from occupied spaces Containment — Fire rated enclosures, battery storage cabinets Monitoring — Battery management systems, thermal monitoring For lithium ion battery fire risk assessment and engineering solutions, contact Magnus Opifex.