Overview
IEC 60086-3:2016 - Primary batteries - Part 3: Watch batteries is the fourth edition (2016) of the international standard that specifies dimensions, designation, test methods and performance requirements for primary batteries for watches. Prepared jointly by IEC TC 35 and ISO TC 114 and published as a double‑logo standard, it updates the 2011 edition and harmonizes cell sizes, service output tests and environmental conditions with related IEC parts. Where multiple test methods are provided, manufacturers must state which method was used when presenting electrical or performance data.
Key topics and technical requirements
- Physical requirements and dimensions: standardized battery sizes, symbols and terminal shapes to ensure mechanical compatibility with watches.
- Terminals and mechanical performance: terminal types, projection limits, deformation and mechanical resistance to pressure.
- Electrical characteristics: standardized electrochemical systems, nominal voltage, open‑circuit voltage (OCV), closed‑circuit voltage (CCV), internal resistance/impedance, capacity and capacity retention.
- Test methods and measurement: a menu of test procedures for OCV/CCV measurement, internal resistance calculation, capacity measurement and discharge profiles; environmental conditioning (temperature/humidity) is specified.
- Leakage resistance and durability tests: high temperature/humidity tests, temperature cycling and visual leakage classification.
- Sampling and quality assurance: sampling by attributes and by variables, product quality indices and acceptance criteria; clarifications provided in Clause 6.
- Visual examination and acceptance: inspection conditions, magnification, lighting and defined leakage classification levels for pass/fail decisions.
- Marking and disposal information: required labeling practices for safe use and end‑of‑life handling.
Practical applications
- Ensures mechanical and electrical compatibility between watch batteries and watch movements during product development.
- Provides test procedures for R&D and type‑approval testing in battery manufacturers’ labs and third‑party test houses.
- Supports quality assurance and production sampling plans to control lot acceptance for commercial supply.
- Informs procurement specifications, safety assessments and compliance documentation for watchmakers and electronics integrators.
- Guides designers in selecting cells with appropriate capacity, internal resistance and leakage resistance for long‑term reliability.
Who should use this standard
- Battery manufacturers and test laboratories
- Watch designers and horology engineers
- Quality assurance and regulatory teams
- Certification bodies and procurement specialists
Related standards
- IEC 60086-1 (General) - harmonized temperature and humidity conditions
- IEC 60086-2 (Physical & electrical) - harmonized cell sizes and service output tests
- IEC 60086-4 / 60086-5 (Safety) - safety requirements for lithium/aqueous batteries
- IEC 60410, ISO 2859, ISO 3951 - sampling and inspection procedures
Keywords: IEC 60086-3:2016, primary batteries for watches, watch batteries, battery dimensions, battery test methods, leakage testing, internal resistance, capacity measurement.