In short
UK law does not set a specific rule for lithium-ion battery storage. It requires employers to assess the risk and control it so far as is reasonably practicable, and it places fire safety duties on a named responsible person. Those duties apply from the first battery, with no quantity threshold.
This page walks through each piece of legislation in the order it usually matters, and what it means in practice for a workplace holding batteries. It is a plain-language summary with links to the legislation itself, not legal advice.
1. Health and Safety at Work etc. Act 1974
The 1974 Act is the foundation. Section 2 requires employers to ensure, so far as is reasonably practicable, the health, safety and welfare at work of their employees; section 3 extends a similar duty to people who are not employees but may be affected — contractors, visitors, residents, passers-by.
“So far as is reasonably practicable” is the phrase that does the work. It means weighing the risk against the cost, time and trouble of controlling it, and it puts the burden on you to show the weighing was done. It is why “no regulation requires a cabinet” and “we should have had a cabinet” can both be true in the same case.
2. Management of Health and Safety at Work Regulations 1999
Regulation 3 of the Management Regulations requires a suitable and sufficient assessment of the risks. For battery storage, “suitable and sufficient” means the assessment names lithium-ion batteries explicitly rather than folding them into a general line about electrical equipment.
In practice an assessor will look for: how many batteries and of what energy content, where they are charged, where they are stored, what happens to damaged ones, who is responsible, and what the emergency arrangements say. See what a lithium battery risk assessment should cover.
3. Fire safety legislation
Fire safety is devolved, so the correct instrument depends on where the premises is.
- England and Wales: the Regulatory Reform (Fire Safety) Order 2005 places duties on the “responsible person” — normally the employer or the person with control of the premises — to carry out a fire risk assessment and put general fire precautions in place. It includes specific provisions where dangerous substances are present.
- Multi-occupied residential buildings in England and Wales: the Fire Safety Act 2021 clarified that the building’s structure, external walls and flat entrance doors fall within the fire risk assessment. This is directly relevant where residents charge e-bikes in communal areas.
- Scotland: the Fire (Scotland) Act 2005 and its associated regulations create an equivalent duty regime.
- Northern Ireland: a separate regime applies. Check the current Northern Ireland fire safety legislation directly rather than citing the 2005 Order.
The fire risk assessment is where battery storage decisions are most often tested after an incident, because it is the document that should have identified the fuel load and the ignition source and said what was done about them.
4. DSEAR 2002 — contested ground
The Dangerous Substances and Explosive Atmospheres Regulations 2002 apply where a dangerous substance creates a risk, including the risk of a flammable atmosphere forming. Cells vent flammable gas when they fail, so a confined and poorly ventilated charging space can be argued into scope.
Whether DSEAR is genuinely engaged by ordinary battery storage is interpreted differently across the industry, and we are not going to pretend otherwise. The practical route around the disagreement is to address ventilation and gas accumulation explicitly in your assessment. Do that and the question becomes academic; skip it and you are exposed whichever reading turns out to be right.
5. Waste batteries
Once a battery is waste — damaged beyond use, end of life, or simply being disposed of — the Waste Batteries and Accumulators Regulations 2009 govern how it is stored, handled and passed on. This is what makes quarantine a compliance matter rather than only good practice, and it is the reason a defined location for damaged packs belongs in your procedures.
Transport is separate again. Moving lithium batteries by road, air or sea is governed by dangerous goods rules, and damaged cells attract stricter requirements than healthy ones. If you move packs between sites, that is a distinct compliance question outside the scope of this page.
6. Product Regulation and Metrology Act 2025
The Act provides powers to make new product safety regulations, including in areas relevant to batteries and chargers. The substance sits in secondary legislation that was still developing at the time of writing, so verify the current position before relying on it in a document. We would rather flag this as unfinished than state a requirement that turns out not to exist.
What this adds up to
- Name lithium-ion batteries in your risk assessment and your fire risk assessment.
- Decide and record what may be brought on site: which packs, which chargers, and whether converted equipment is permitted.
- Decide where charging happens, and why — particularly relative to escape routes and sleeping accommodation.
- Define the quarantine arrangement for damaged and waste packs before you need it.
- Keep the evidence for any control you rely on, including a cabinet’s tested performance and the standard it was tested to.
- Make sure the emergency plan tells staff to evacuate rather than intervene, and that they know it.
Frequently asked questions
Is there a legal limit on how many lithium batteries I can store?
No quantity threshold exists in UK health and safety or fire safety law for lithium-ion battery storage. The duty to assess and control the risk applies regardless of quantity. What quantity changes is what a reasonable control looks like — the same legal test produces very different answers for two packs and for four hundred.
Who is the “responsible person” for battery storage?
Under the Regulatory Reform (Fire Safety) Order 2005 in England and Wales, it is normally the employer where the premises is under their control, or otherwise the person who has control of the premises in connection with a trade or business. In multi-occupied buildings there can be more than one, with duties to cooperate. If nobody in your organisation can name who it is, that is itself a finding worth acting on.
Can I be prosecuted if a battery fire happens despite my controls?
Enforcement turns on whether you did what was reasonably practicable, not on whether an incident occurred. A documented assessment, controls proportionate to the risk, and evidence that they were implemented and maintained are the defence. An incident with no assessment and no controls is a very different position from an incident despite both.
Do I need a specific standard of cabinet to comply?
No UK regulation requires a cabinet at all, let alone one tested to a particular standard. Where a cabinet is part of your controls, tested performance is useful evidence that the control does what you claim — which is a different and more honest argument than saying the standard is mandatory. See the standards comparison.