Where Is the Boundary Between LMT and Portable Batteries?

The boundary between light means of transport batteries and portable batteries is drawn by the category definitions in Regulation (EU) 2023/1542, not by the size of the vehicle or the size of the pack alone. A battery is LMT when it meets the sealing, weight, traction and vehicle category tests, and portable when it meets the residual portable tests. A battery that sits near the boundary, such as a traction pack for a light vehicle that weighs close to a portable pack, needs the full test sequence, because a single feature check will misclassify it.

Boundary work matters because the passport duty turns on it. An LMT battery needs a passport from 18 February 2027, while a portable battery does not. A boundary error therefore creates either a missing passport for an LMT battery or an unnecessary passport claim for a portable battery. Both errors mislead later actors, and both are avoidable by applying the tests in order and recording each result.

What is the first boundary test?

The first boundary test is traction purpose and vehicle category. A battery designed to provide traction power to a vehicle in category L is on the LMT side of the boundary, subject to the sealing and weight tests. A battery designed to power a portable device, a power tool or a household appliance, without traction purpose for a category L vehicle, is on the portable side, subject to the other category exclusions. Design purpose at the time of placing on the market is the evidence, not later use by a modifier or holder.

A boundary note should start with the design purpose statement from design documents, not with the vehicle name in a retail listing. A retail listing may describe a vehicle as light, small or portable, and none of those adjectives decides the category. The design purpose statement, the vehicle category material and the traction specification together decide the first test, and the note should cite all three.

How does weight separate the two categories?

Weight separates the categories in two places. Portable batteries weigh 5 kilograms or less, while LMT batteries weigh 25 kilograms or less. A traction pack weighing 6 kilograms therefore cannot be portable on weight alone, and must be assessed under the LMT, industrial or electric vehicle tests. A traction pack weighing 4 kilograms could meet the portable weight test, but the traction and vehicle tests place it on the LMT side, because portable status requires exclusion from the LMT definition.

Worked check: a 4 kilogram sealed traction pack for an electrically assisted cycle is LMT, not portable, even though the weight is inside the portable limit. A 4 kilogram sealed pack for a power tool, with no traction purpose, is portable. The weight is identical; the purpose and vehicle tests produce different categories, and the passport duty follows the LMT result in the first case only.

What about packs that serve both traction and auxiliary purposes?

A pack that serves both traction and auxiliary purposes is assessed on its design purpose as a traction battery, where the traction function is a designed purpose of the battery. A separate auxiliary battery in the same vehicle, designed only for starting, lighting or auxiliary power, is assessed separately and may fall into a different category. The two batteries in one vehicle can therefore carry different categories and different duties, and the vehicle record must keep their identifiers and categories distinct.

The assessment should identify each battery in the vehicle separately, with a category note for each. A vehicle file that lists only one battery, or that merges traction and auxiliary packs into a single entry, will misstate the duties for at least one pack. A handover check should list each battery identifier, each category and each passport result separately, so that a later repairer can identify which pack carries a passport and which does not.

How do removable packs affect the boundary?

Removability does not decide the boundary. Portable batteries are removable by the end user, LMT batteries are removable and replaceable by an independent professional, and both categories therefore feature removable packs. A removable pack for a cycle is not portable because it is removable, and a removable pack for a power tool is not LMT because it is removable. Removability is a design duty that follows classification; it is not a classification test, and using it as a test inverts the Regulation sequence.

Boundary notes should keep classification tests and design duties in separate sections. The classification section records sealing, weight, purpose and vehicle category. The design duty section records removability, replaceability and labelling presentation for the resulting category. A note that merges the two sections invites the error of treating a design feature as a category test, and a reviewer cannot tell whether the category or the duty was decided first.

What evidence resolves a close boundary case?

Close boundary cases are resolved by weight verification, design purpose documents, vehicle category material and, where needed, manufacturing records. A close case with a weight near 5 kilograms or near 25 kilograms needs a second weight verification, with the measurement basis stated. A close case with an ambiguous vehicle category needs vehicle type approval or classification material, not a retail description. A close case with a dual purpose pack needs the design specification that states the traction purpose and the auxiliary purpose separately.

Evidence should be filed as a boundary pack: classification note, weight evidence, design purpose extract, vehicle category material and duty map. The pack should be reviewed by a second checker where the case is close, and the review should be dated. A boundary decision made by one checker without a second review, on a single piece of evidence, is a weak decision, and it will be difficult to defend if a market surveillance authority queries the category.

How should boundary uncertainty be labelled?

Boundary uncertainty should be labelled provisional, with the open tests named and a review trigger set for receipt of the missing evidence. A provisional category may be used for internal planning, but it should not be copied into a passport, a label or a sales description until the tests are closed. As checked on 28 October 2026, the boundary tests are fixed in the Regulation text, while the evidence for a specific battery is a fact to be verified. This guide gives general educational information only and is not individual legal advice. A reader with a specific battery or market decision should check the current Regulation text and any applicable delegated act, as checked on 28 October 2026, before acting.

This guide gives general educational information only and is not individual legal advice. A reader with a specific battery or market decision should check the current Regulation text and any applicable delegated act, as checked on 28 October 2026, before acting. The boundary is a test sequence, and a close case should be labelled provisional until every test has evidence.