What does rated capacity mean?
Rated capacity matters because it is one of the core technical attributes used to describe and compare batteries, and it can influence passport content, product documentation, and category-specific interpretation.
rated capacity
Declared battery capacity in ampere-hours under reference conditions.
1 official sources1 context sourcessingle_source
Official definitions by source
EU Battery Regulation
Regulation (EU) 2023/1542 concerning batteries and waste batteries
the total number of ampere-hours (Ah) that can be withdrawn from a fully charged battery under reference conditions
Reference: Annex IV, point 1
Standards and implementation context
These entries are non-verbatim context summaries. They are not presented as public legal definitions.
DIN DKE SPEC 99100
DIN DKE SPEC 99100:2025-02 — Requirements for data attributes of the battery passport
DIN DKE SPEC 99100 uses rated capacity as implementation context for battery-passport technical data attributes.
Implementation-context summary only; not a verbatim DIN definition. This is a copyrighted standard, so Minespider should use it as standards context rather than republishing the standard text.
Reference: Section 3.40
Practical application
In implementation, rated capacity should be stored with units, test/reference conditions, declaration source, and update logic where later lifecycle measurements differ from initial declared performance.
Minespider commentary
Rated capacity is often confused with live battery condition. Rated capacity is a declared technical attribute, while state of charge and state of health describe changing condition. Keeping those concepts separate helps passport users distinguish design/specification data from operational or degradation data.
Common confusions
- Do not confuse rated capacity with state of charge.
- Do not confuse rated capacity with state of health or remaining useful capacity.
- Do not record a capacity value without units and reference context.