Key takeaway
What This Development Means
CPSC is reviewing UL 4200A-2026 under Reese's Law, but the current UL 4200A-2023-based requirements in 16 CFR Part 1263 remain mandatory. Manufacturers, importers and retailers should compare the editions and submit safety evidence by 17 September 2026 without assuming that the revised standard already applies.
Does UL 4200A-2026 Already Replace The Mandatory 2023 Edition?
No. CPSC is assessing the revision under Reese's Law. The existing rule incorporating UL 4200A-2023 remains the current mandatory baseline unless and until the statutory review results in the revised standard becoming effective.
When Could The Revised Standard Become Mandatory?
If CPSC does not reject it in whole or part within 90 days of notification, the accepted revision becomes a consumer product safety standard 180 days after notification, or later if specified. The notice omits the exact notification day, so a calendar date cannot yet be verified.
The US Consumer Product Safety Commission (CPSC) is reviewing UL 4200A-2026, the revised voluntary standard for products containing button cell or coin batteries. Comments must reach docket CPSC-2023-0004 by 17 September 2026, and the Commission says it will not consider late submissions.
CPSC UL 4200A-2026 Review Starts A Statutory Decision Process
Reese's Law addresses ingestion hazards to children aged six and under. Its definition covers a single-cell battery whose diameter is greater than its height and any other battery technology that the Commission determines presents an ingestion hazard. CPSC's current mandatory rule, 16 CFR Part 1263, incorporates UL 4200A-2023 and adds requirements.
That existing baseline remains in force. It includes performance tests and warnings for covered consumer products, battery packaging and instructions. CPSC guidance says zinc-air button cells are outside the rule, while toys intended for children under 14 are exempt from 16 CFR Part 1263 if they comply with the battery-accessibility and labelling requirements in 16 CFR Part 1250 and ASTM F963.
Covered product compartments generally need a tool or at least two simultaneous and independent movements to open. Products also face use-and-abuse testing and warning duties. Businesses should confirm the precise rule and test method for each product rather than relying on a general summary.
What Changed And What Remains Unchanged
UL has approved and published UL 4200A-2026 and notified CPSC. The Commission is now deciding whether the revision improves safety. The notice is a request for comment, not an immediate amendment to 16 CFR Part 1263, despite being displayed in the Federal Register's proposed-rule category.
Under section 2(f) of Reese's Law, CPSC may reject all or part of a revision within 90 days after receiving notice if it concludes that the change does not improve safety. If it does not reject the revision, the accepted standard becomes a consumer product safety standard 180 days after notification, unless CPSC specifies a later date in the Federal Register.
The notice leaves the notification date as "August XX, 2026". Consequently, businesses should not calculate a binding transition date from this document. They should wait for a Commission determination or corrected official record while maintaining compliance with the 2023-based rule.
Implications For Product And Retail Businesses
Manufacturers and importers should compare UL 4200A-2026 with current designs, test reports, warnings and technical files. Battery and component suppliers should identify changes that affect compartment construction or verification evidence. Distributors, retailers and marketplaces should keep present compliance checks active and prepare to update supplier documentation if CPSC accepts the revision.
Inference: the unusually short consultation reflects the statutory review clock. Submissions that link a specific revised clause to child-access, use-and-abuse or warning performance are likely to be more useful for the decision than general comments about cost or support.
Practical Actions
Obtain lawful access to UL 4200A-2026, complete a clause-by-clause gap assessment and preserve current 2023 evidence. Submit focused safety data by 17 September where revisions improve or weaken protection, and monitor CPSC for its formal decision and any corrected timing information.
Related Foresight coverage includes California SB 501 battery recycling and EU battery passport guidance.
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