Yes. A business battery is safe when design, placement and inspection work as one safety system. Above 10 kWh, environmental conditions apply. Above 20 kWh, fire zones ask for a preliminary study, and the AREI wants a dedicated room or battery cabinet. An approved body inspects before use. Tell your insurer before the battery arrives.
You want 50 or 150 kWh by the warehouse or in a container. The architect asks about the permit, the prevention advisor about fire, the insurer about the spot. Forums answer with US rules.
Our off-grid battery in Beveren holds 154 kWh: fifteen times the 10 kWh threshold, over seven times the 20 kWh one. A farm in St-Georges-sur-Meuse runs fully off-grid on 46.2 kWh.
How safe is a lithium battery in a business?
A lithium battery is safe while its cells stay within their limits of voltage, current and temperature. The risk is thermal runaway. The EU Battery Regulation warns that one overheating cell can cascade through the whole battery and release a lot of gas.
So safety is a chain, not one feature.
- Tested cells and modules: proof that one failing cell does not set fire to the rest.
- A battery management system (BMS) that watches every cell and stops charging or discharging before a limit.
- The right spot: a fire-rated room, a battery cabinet or a container at a safe distance.
- Early detection and an emergency stop the fire service can find.
- Inspection and upkeep by an approved body, before use and periodically.
Chemistry matters too: compare LFP, NMC and sodium-ion for a business battery. Sizing is covered in what a BESS is and when battery storage pays off.
Our Battery Disassembly Center screens and dismantles old and damaged lithium batteries from cars, home batteries and bikes. Our team followed the battery specialist training at SYNTRA.
Which rules decide business battery safety from 10 kWh and 20 kWh?
Two sizes matter: about 10 kWh for the environmental rules, and 20 kWh for the fire service and the battery room. The threshold reads 10,000 Ah x V: a 48 V battery reaches it at about 208 Ah (48 x 208 = 9,984).
| From | Rule | What it asks |
|---|---|---|
| Any size | AREI inspection, grid operator registration | Conformity check by an approved body before use; in Flanders, registration with Fluvius |
| 2 kWh (industrial battery) | EU Battery Regulation | Battery passport for batteries placed on the market or put into service from 18 February 2027 |
| 10,000 Ah x V (about 10 kWh) | Environmental rules in Flanders, Wallonia and Brussels | Flanders: VLAREM II chapter 6.13. Wallonia: declaration under rubric 40.10.01.02. Brussels: environmental permit |
| 20 kWh (20,000 VAh for grouped fixed battery units) | AREI chapter 7.103 and fire zones | Battery cabinet or dedicated electrical room (non-household installations; an office or workshop is not household); preliminary study for the fire service |
Does a battery fall under VLAREM, and do you need a battery container permit?
Yes, from 10,000 Ah x V, but not as a classified installation. Battery systems are not on the VLAREM classification list, says the Departement Omgeving. The conditions of VLAREM II chapter 6.13 apply instead.
| VLAREM II chapter 6.13 | What it asks for fixed batteries above 10,000 Ah x V |
|---|---|
| Code of good practice | Built to one; the electrical part follows the AREI and the Codex on well-being at work |
| Room | A dedicated room, space or cabinet for batteries that are not "dry batteries": walls and ceiling fire class A1, fire resistance EI1 30, self-closing doors |
| Ventilation | Permanent and effective, according to NBN EN 62485-3 |
| Fire extinguishers | At least 1 extinguishing unit per 150 m², with at least 2 per building level |
| Fire discipline | No smoking; hot work only with a written fire permit |
Watch out
VLAREM does not say whether a sealed lithium battery counts as a "dry battery". Settle it early with your permit advisor or the fire service: it decides whether you need a separate fire-rated room.
The permit depends on where the battery stands, and each region has its own procedure. The fire service advises on the application.
| Where | Permit or procedure |
|---|---|
| Flanders, inside an existing business building | The exemption for interior changes without structural work can apply (Departement Omgeving) |
| Flanders, outside on a farm, serving your own farming | Can fall under the exemption for constructions for professional crop or livestock farming; otherwise a permit |
| Flanders, outside on other business sites | A container or cabinet is a construction: check with your municipality before you order |
| Wallonia, above 10,000 Ah x V | Rubric 40.10.01.02: declaration with the municipality; show the RGIE conformity report and latest periodic report on request |
| Brussels, above 10,000 VAh on one circuit (batteries and UPS units) | Environmental permit; room with EI1 30 self-closing doors, (R)EI 60 walls, floor and ceiling, ventilation, inspection every 5 years |
Batteries on a building site follow other rules: see our article on the site battery.
What does the fire service ask for a battery above 20 kWh?
Above 20 kWh, fire zones ask for a design to a good-practice rule for battery storage, preferably PGS 37-1. Belgian law has too few specific rules, so zones base their fire prevention report on such references, which gives them weight in your permit. Brandweer Zone Rand published its list in August 2025.
| Brandweer Zone Rand asks | What it means |
|---|---|
| A preliminary study | Presented to the fire service in a meeting before the permit application |
| Early detection | In the installation |
| Pressure relief and a propagation test | Relief towards an area where nobody walks; a test must show that a thermal runaway in one unit never spreads to the next |
| Access and water | Two independent access routes where the site allows it; enough hydrants within 80 m, or else an above-ground hydrant within 30 m of every fire service access |
| Markings and a fire information cabinet | Outside: battery type, power, voltage, a 24/7 emergency number, the emergency stop and a site plan |
| Fire water retention | You assess whether it is needed |
The key demand: a test must show that a thermal runaway in one unit never spreads.
Not every zone uses the same reference. Zone Rand prefers the Dutch PGS 37-1, a guideline rather than Belgian law, and also cites NFPA 855. Brandweerzone Vlaamse Ardennen has its own guideline for outdoor systems above 20 kWh, so ask your zone first.
Important
As an employer you also need a fire risk analysis under the Codex on well-being at work (book III, title 3). The battery belongs in it, with the extinguishers and procedures that follow.
How far must a battery container be from the boundary: inside or outside?
Under PGS 37-1, a standalone container closer than 5 m to the boundary, other buildings or combustible objects needs 60 minutes of fire resistance. From 5 m, 30 minutes is enough; from 10 m, nothing.
Fire resistance a battery container needs under PGS 37-1, by distance
No combustible storage or fire-prone work is allowed inside those distances. The Vlaamse Ardennen guideline asks 6 m to installations, storage, parking or the boundary. It adds a 3 m zone without shrubs or trees and an EI 30 container.
The spot decides most of the cost. At 3 m from the boundary a container needs fire-resistant walls; at 10 m not. Discover that after delivery, and you move it or build walls.
Plan the spot on paper: boundary, buildings, parking, fuel and waste, room for a fire truck. A spot 10 m from everything is the cheapest safety measure you will buy. The rules look at room, distance, detection and documents, so the "safest" chemistry does not replace it.
Inside the building
- Simpler to connect, protected from the weather
- Dedicated room or battery cabinet above 20 kWh (AREI)
- A store room needs a fire-rated room around the battery
- Walls, ceiling and doors EI1 30 where VLAREM requires a room
- Ventilation per NBN EN 62485-3
- No other objects in the battery room
- Warning signs, no access for unauthorised people
Outside, in a container
- Keeps a fire away from your building
- Distance: 5 to 10 m or more (PGS 37-1), 6 m in some zones
- Access for the fire truck and water nearby
- Fire information cabinet outside the container
- Protection against vehicles near roads and parking
- Planning permit check with the municipality
Watch out
In rooms open to the public, the AREI wants fixed batteries in enclosures of at least IP 2X, locked with a safety key.
Our verdict
No fire-rated room and no outdoor spot that keeps the distances? Then a big battery is the wrong answer. Do not squeeze 100 kWh next to the stock: look at a smaller system, another spot or other measures.
For peaks, load management often does part of the job: read how peak shaving works and when a battery pays off. For off-grid sites, see which battery suits an off-grid system and what else an off-grid system needs.
Which inspection and certificates does a business battery need (AREI, IEC 62619, UL 9540A)?
An approved body inspects every electrical installation before use, and a business installation every 5 years after that. Your battery is part of it.
- DC rules: since 1 April 2026, book 1 of the AREI updates the rules for direct current, such as batteries and solar panels (royal decree of 6 October 2025).
- Battery room markings (AREI 7.103): nominal voltage, no access for unauthorised people, the electrical danger sign.
- Flanders: register with Fluvius. Below 25 kVA you do it in Mijn Fluvius with a valid AREI inspection; larger systems need a grid study.
- Wallonia and Brussels: the inspection reports belong in the environmental file.
For the battery itself, ask for four documents.
IEC 62619
The international safety standard for industrial lithium cells and batteries, including stationary storage and UPS. Ask for the test report, not a logo.
UL 9540A
The North American test for thermal runaway fire propagation, at cell, module, unit and installation level: the proof fire zones ask for.
EU technical documentation
Tests showing the stationary system is safe in normal use (thermal propagation, fire, gas emission), plus instructions for fire or explosion.
The manual and the emergency plan
How the system shuts down, where the emergency stop is, what the fire service must do or avoid. Zone Rand wants it in the fire information cabinet.
PGS 37-1 bases its 20 kWh starting point on NFPA 855. When a supplier only shows a CE mark, ask for the documents above.
Not sure where your battery can stand? Call us or send a message.
What changes with the battery passport 2027, and what do you tell your insurer?
From 18 February 2027, every industrial battery above 2 kWh placed on the market or put into service needs a battery passport. This electronic record of the model and that battery opens through a QR code.
Since 18 August 2024, the BMS of a stationary system must already hold up-to-date data on state of health and expected lifetime. The European Commission confirmed the 2027 date in its guidance of August 2026.
For you, the passport is a traceable history: what the battery is, how it was used, how to recycle it. OVAM follows up the producer obligations in Flanders. At the end of its life, read what a company must do with old lithium batteries.
Tell your insurer before installation, and ask in writing whether your policy needs a change. A battery changes the building risk. Send the papers you need anyway:
- size (kWh), chemistry and location, with a site plan;
- the AREI conformity report and the fire service advice or preliminary study;
- the IEC 62619 report and the EU technical documentation;
- your fire risk analysis and emergency procedure.
Forum owners fear an insurer will point to an uninspected installation after a fire. Leave nothing to point to.
Frequently asked questions
How do I know whether my battery is above 10 kWh?
Multiply ampere-hours by voltage. A 48 V battery of 280 Ah is 13,440 Ah x V, above the 10,000 Ah x V threshold.
Do forklift chargers fall under the same rules?
In Flanders, fixed chargers above 10 kW, such as fast chargers, fall under VLAREM II chapter 6.13. They need 2.5 m from non-A1 materials or combustible goods, or a separate room. Brussels exempts forklift batteries and EV chargers.
Does the AREI battery room rule apply to a home battery?
No. AREI chapter 7.103 excludes household installations. Elsewhere it covers batteries from 300 Wh (at a 5-hour discharge) or above 120 V.
Who do I inform in Wallonia before I switch on the battery?
The local fire service: the Walloon conditions require you to report your fire prevention measures before commissioning.
Want to know where your battery can stand?
Send us a site plan, the spot you have in mind and your latest invoices or consumption data. We size the kWh and kW, which sets the thresholds, and design location, documents and certificates. Installation ends with the inspection by an approved body, followed by daily monitoring and support.
Our battery systems for businesses range from SME installations to modular systems up to 1 MW.
Sources
- Departement Omgeving: batteries and VLAREM
- VLAREM II chapter 6.13 (EMIS Navigator)
- VLAREM II section 6.13.2: transformers, fixed batteries and charging (EMIS Navigator)
- Brandweer Zone Rand: energy storage systems above 20 kWh
- Brandweerzone Vlaamse Ardennen: fire safety guideline for ESS above 20 kWh outdoors (BVLAR)
- PGS 37-1: lithium energy storage systems, version 1.1 (April 2026)
- FPS Economy: AREI book 1 (2026)
- FPS Economy: inspection of non-household electrical installations
- Prebes: royal decree of 6 October 2025 amends book 1 of the AREI
- Fluvius: register a storage system
- Wallonia: conditions for stationary batteries above 10,000 Ah x V (Wallex)
- Leefmilieu Brussel: stationary batteries and UPS units
- IEC 62619:2022
- UL Solutions: UL 9540A test method
- Regulation (EU) 2023/1542 on batteries
- European Commission: guidance for the digital battery passport (August 2026)
- OVAM: Regulation (EU) 2023/1542