The First Ten Minutes: A Lithium-Ion First-Response Framework for MEWP Charging Bays

Electric powered access is now a familiar sight on UK construction and facilities sites, and the charging bay has become part of the estate. But the presence of lithium-ion batteries changes the emergency question. A conventional fire plan built around bins, kitchens or plant rooms may not give a first responder the information they need when a battery pack begins to vent. The first ten minutes are not simply a test of extinguisher placement; they are a test of whether the site has made the right decisions in advance.

Risk assessment begins with the battery, not the bay

A defensible plan starts with the battery chemistry and format specified for the machines on site. The fire risk assessment should record the type and number of batteries, the chargers in use, the charging regime and the maximum state of charge held in the bay. It should also capture foreseeable faults: damaged leads, incompatible chargers, obstructed ventilation and the practice, however well intentioned, of charging overnight in an unoccupied building. Under the Regulatory Reform (Fire Safety) Order 2005, the responsible person must make a suitable and sufficient assessment of fire risk. Lithium-ion thermal runaway is a hazard that merits explicit treatment rather than a footnote. The assessment should identify ignition sources, the likely development of an incident and the people at risk, including contractors who may be unfamiliar with the bay.

Isolation and signage that buy time

When a battery fire is suspected, the first action is not to approach the machine. It is to raise the alarm and, if it can be done without exposure, isolate the charging equipment. The plan should identify the isolation point clearly, mark it on the site emergency plan and ensure it is accessible. Charging bays should carry fire action notices that reflect the actual equipment present, not generic wording. Signage should state the battery hazard, prohibit smoking and naked flames, and show the emergency isolation switch. Where the bay is in a locked compound, the fire service needs a known access route; where it is indoors, the plan should consider smoke spread and the need to keep evacuation routes clear. Clear signage does not replace training, but it reduces the chance that a first responder makes an improvised decision under pressure.

Extinguishers are a decision, not a default

There is a temptation to treat a nearby extinguisher as the answer to every fire. For lithium-ion incidents, that assumption is unsafe. A portable extinguisher may knock down visible flame, but it may not stop thermal runaway inside a cell; the fire can reignite hours later. The site plan should therefore define who, if anyone, is authorised to attempt firefighting and under what conditions. In most facilities, the defensible first response is to evacuate, call 999 and meet the fire service with information. If the organisation chooses to permit trained staff to use extinguishers on an incipient fire, the plan must specify the extinguisher type, the training standard and the point at which they withdraw. It should also state that no one should move a smoking or overheating battery. These are not caveats; they are the decision points that make the response defensible.

Evacuation, roll call and the fire service handover

A charging bay incident can produce dense smoke and toxic off-gassing. Evacuation should follow the site fire procedure, but the plan should account for the bay location: an outdoor compound may require a different assembly point from an indoor plant room. The roll call should include contractors and visitors, not just direct employees. The fire service handover is where preparation shows. A premises information box or emergency pack should contain a simple battery schedule: chemistry, quantity, machine types, charger locations, isolation points and any relevant safety data sheets. The person meeting the fire service should be named in the plan and trained to give a concise brief. They should not speculate about the cause; they should provide facts and point to the isolation point and access route.

Drills that test the plan, not the paperwork

A plan that has never been exercised is a hypothesis. The drill should be site-specific: alarm activation, evacuation, roll call, isolation and the handover brief. It should test whether the assembly point is safe from smoke, whether the isolation point is reachable and whether the fire service access route is clear. It should also test the decision not to fight the fire, because that is often the hardest instruction to follow. Record the drill, note the gaps and set actions with owners and dates. A short tabletop exercise with the local fire and rescue service can be valuable, particularly for sites with large battery inventories or limited access. The aim is not a perfect performance; it is a credible, repeatable response that stands up to scrutiny.

Making the plan live

The charging bay will change as the fleet changes. New machines, new chargers and new battery formats can invalidate the assumptions in the plan. A periodic review, at least annually and whenever the equipment changes, keeps the risk assessment, signage, isolation arrangements and drill record aligned. Facilities teams should treat the first-response plan as part of the access equipment regime, not a separate fire-safety artefact. The test is simple: if a battery begins to vent this afternoon, can the site raise the alarm, isolate safely, evacuate confidently and brief the fire service without guesswork? If the answer is uncertain, the plan needs work.