EU Batteries Regulation Compliance for Energy Storage Systems: A Certification and Documentation Guide for Korean Exporters

Where Stationary ESS Sits Under the EU Batteries Regulation

Regulation (EU) 2023/1542, adopted 12 July 2023 and published in the Official Journal on 28 July 2023, replaced the older Battery Directive with a single set of rules on sustainability, safety, labeling, and due diligence for all batteries placed on the EU market, according to EUR-Lex.

Many exporters look for a separate rulebook for energy storage systems and do not find one. That is because there is not one. Stationary battery energy storage systems are treated as a subcategory of industrial batteries, not a distinct product class, according to Energy-Storage.News.

This matters for planning. An ESS above 2 kWh of internal storage used in a stationary application must meet the general industrial-battery obligations in Articles 6, 7, 8, 9, 10, and 13, plus two extra articles written specifically for stationary storage. Article 12 requires safety-test evidence under Annex V. Article 14 requires state-of-charge data, expected lifetime information, and a software reset option. Every deadline described in this guide sits on top of that same industrial-battery foundation.

The Certification Path: CE Marking, Conformity Assessment, and UN 38.3 Transport Testing

The mandatory CE marking and conformity assessment procedure for EU-market batteries, including stationary ESS, has been in effect since 18 August 2024, according to Energy-Storage.News. If your product has not yet been through this process, it is already past the compliance deadline, not ahead of it.

Getting to CE marking and a valid EU Declaration of Conformity means working through four linked steps: confirming the industrial-battery classification, meeting the Article 12 and Article 14 stationary-ESS requirements, completing transport-safety testing, and then affixing the mark itself.

That transport-safety step is easy to underestimate because it is not an EU Batteries Regulation provision at all. Lithium cells and batteries shipped by air, sea, rail, or road must pass the eight UN 38.3 tests — covering altitude simulation, thermal cycling, vibration, shock, short circuit, impact, overcharge, and forced discharge — set out in the UN Manual of Tests and Criteria, according to UNECE. This is a global transport standard incorporated into IATA and ICAO air rules, the ADR road rules used across the EU, and the IMDG sea rules. It applies to any EU-bound ESS shipment containing lithium cells, regardless of where the EU Batteries Regulation timeline stands.

A detail that trips up exporters who last checked the rule before 2020: a safety data sheet that simply mentions UN 38.3 is no longer sufficient on its own. Since 1 January 2020, manufacturers and distributors of lithium-ion and other lithium batteries must give every party in the supply chain a detailed UN 38.3 test summary document, according to Deutsche Recycling. Your freight forwarder, and any EU importer downstream, can ask for that document specifically — and a vague SDS reference will not satisfy the request.

The Documents an EU Importer Will Ask For

An EU importer of Korean ESS is not going to generate your compliance paperwork. They will ask you for it, and the request usually arrives as a checklist rather than a single certificate. Six items make up that checklist at present.

The EU Declaration of Conformity and CE-marking record come first, since that requirement is already in force. Article 12 and Annex V safety-test evidence for the stationary application follows, since it is specific to ESS rather than industrial batteries generally. The UN 38.3 detailed test summary document is a third, separate item — and, as noted above, must be the full summary, not a safety-data-sheet mention.

Two more items are the physical Annex VI Part A label, mandatory from 18 August 2026, and it must carry manufacturer identification, battery category, place and date of production, weight, capacity, hazardous-substance composition, the correct fire-extinguishing agent, and any critical raw materials present above 0.1% by mass, according to Impala Services. The sixth is the carbon footprint declaration data, due for industrial batteries above 2 kWh from 18 February 2026, per TUV Rheinland — a number your EU buyer's downstream customers will increasingly ask them to disclose.

The Compliance Timeline: What Is Already Due, What Is Coming, and What Was Delayed

Two dates on this timeline are frequently confused with each other, and getting the distinction right matters for planning. The physical Annex VI Part A label is due 18 August 2026. The digital battery passport with QR-code access is a separate, later deadline: 18 February 2027, according to TUV Rheinland and confirmed by Impala Services' retailer-facing documentation checklist. A label is not a passport, and having one ready does not mean the other is covered.

Laid out in order, the compliance calendar for a Korean stationary-ESS exporter runs: CE marking and conformity assessment, already in force since 18 August 2024; the carbon footprint declaration for industrial batteries above 2 kWh, from 18 February 2026 (electric-vehicle batteries had an earlier February 2025 start, but that track does not apply to stationary ESS); the physical Annex VI label, from 18 August 2026; the digital battery passport, from 18 February 2027; and supply-chain due diligence, now due from 18 August 2027 after a two-year postponement described below.

Treat this calendar as a planning tool, not a single deadline. Certification-body sources recommend engaging conformity-assessment resources well before a due date arrives, given typical assessment lead times, rather than starting the process at the deadline itself.

Supply-Chain Due Diligence: Postponed to 18 August 2027

This is the single most time-sensitive fact in this guide, because a real regulatory change moved it recently. Article 48 due-diligence obligations, covering cobalt, lithium, natural graphite, and nickel, were originally set to apply from 18 August 2025. Regulation (EU) 2025/1561, adopted 18 July 2025 and published in the Official Journal on 30 July 2025, amended Article 48(1) to push that date back two years, to 18 August 2027, according to infoDPP. The European Commission cited insufficient notified-body capacity for third-party verification and the need for more time to adjust cobalt, lithium, graphite, and nickel supply chains.

Even after that postponement, not every exporter is in scope. As currently in force, Article 48 exempts economic operators whose net turnover in the preceding financial year was below EUR 40 million, unless they belong to a corporate group whose consolidated turnover exceeds that limit, according to batteryregulation.eu. A Korean SME ESS maker below that threshold does not carry the due-diligence obligation under today's binding rule, even once 18 August 2027 arrives.

Last updated: 2026-07. The regulatory information in this article is current as of July 2026 and is provided for informational purposes only. EU Batteries Regulation phase-in dates and thresholds continue to change, as the 2025 due-diligence postponement shows. Verify current requirements with a notified body, customs broker, or EU compliance counsel before making certification or export decisions.