Button battery rules: what a tracker's battery door must do

Button battery rules are not usually news twice in a fortnight, but the first half of September 2026 produced a recall and a standards consultation within a week of each other, and both were about the same thing: the little door that holds a coin cell in place. Anyone who owns a finding tag owns one of those doors, so it is worth knowing what it is meant to do.

Two events, one week apart

On 3 September 2026 the United States Consumer Product Safety Commission published a notice in the Federal Register saying that UL had revised the voluntary standard covering consumer products that contain button cell or coin batteries, and invited comment on the new edition. The regulator's framing was narrow and specific:

CPSC is assessing the revised voluntary standard to determine, consistent with section 2(f) of Reese's Law, its effect on the safety of button cell or coin batteries and consumer products containing such products.

The comment window ran until 17 September 2026. That standard, ANSI/UL 4200A, is not a footnote: it is the document the American rule at 16 CFR part 1263 points to, which is how a voluntary technical text ends up with legal teeth.

One week into that window, on 10 September 2026, the same regulator announced a recall of roughly 179,700 packs of finger light toys sold through Amazon between 2015 and July 2026. The stated reason was that the button cells inside could be reached by a child, which breaches the mandatory toy standard. The commission's own hazard wording is blunt, and it is the reason every one of these rules exists:

If button cell or coin batteries are swallowed, the ingested batteries can cause serious injuries, including internal chemical burns, and death.

No injuries had been reported in that case. The recall was issued on the design alone, which tells you how seriously the accessible cell is treated.

What the standard asks a battery cover to do

Strip away the clause numbers and the requirement is mechanical. A compartment holding a replaceable coin cell has to resist a curious child, and the accepted ways of achieving that are a fastener that needs a tool, typically a screwdriver or the edge of a coin, or a catch that cannot be released without two independent movements of the hand at the same time.

The second option is where cheap hardware fails. Two movements means two, genuinely: a latch that one fingertip can slide and lift in a single motion is one movement drawn as two. Alongside the compartment itself, the standard covers warning markings on the product and its packaging, instructions, and performance tests such as drop and impact, because a cover that survives a shelf and fails a staircase has not solved anything.

What a UK buyer should take from a US notice

The legal instruments differ. The United States has Reese's Law and a mandatory federal standard behind it; Britain works through the general safety duty that applies to any consumer product, through the toy rules for anything that is a toy, and through PAS 7055:2021, the specification the British Standards Institution published in 2021 for button and coin batteries, which is voluntary in itself.

The practical consequence is that the American paperwork does not travel, but the hardware does. A marketplace listing shipped from the same factory to both countries is the same object either way, so the compartment design is worth inspecting yourself rather than assuming a rule caught it. The questions are simple enough to ask in a shop doorway.

1. Does the cover need a deliberate action, a tool or a press and twist, rather than a fingernail?
2. Does it close positively, with a click or a stop, so a half closed cover is obvious?
3. Is the cell held after a drop? Drop it on a hard floor from waist height and look.
4. Do replacement cells come in a stiff child-resistant card rather than loose in a bag?
5. Is there a warning anywhere on the item or its box? Its absence tells you what the maker skipped.

If a device fails those, the answer is not a lecture about rules, it is to keep it out of reach of small children and to buy better next time. Our earlier piece on coin cell safety and the OPSS review covers the disposal and take-back side, which is the other half of the problem.

How BlueTag handles the cell

The back of a BlueTag is a cover that has to be turned against a stop to release, not a lid you lever off with a thumbnail, and the CR2032 sits under it rather than behind a flap. That cell is 20 mm across and about 3.2 mm thick, which is precisely the geometry the safety literature is concerned with, and it runs for up to two years, so the cover comes off roughly twice in the working life of the tag rather than every month.

Nothing loose ships with it either. A box holds two BlueTag trackers with their cells already fitted, two key rings and a setup sheet, and no spare batteries, because a bare cell posted in a padded envelope is the exact hazard every one of these documents is trying to design out. When a replacement is due, a supermarket blister card costs a couple of pounds and arrives in the packaging the standards ask for.

The rest of the tag is as published: an iPhone or an iPad running at least iOS 14.5, nothing whatever on Android, a direct link out to 60 m / 200 ft with the Apple Find My network past that, a buzzer rated 80 to 100 dB and an IP67 shell. The full specification is on the front page.

Sources

• US Consumer Product Safety Commission, 10 September 2026. Cade California Electronic recalls finger light toys due to risk of serious injury or death from battery ingestion
• Federal Register, 3 September 2026. Notice of availability and request for comment: revision to the voluntary standard for products containing button cell or coin batteries
• ConsumerAffairs, 11 September 2026. Consumer product safety recall roundup
• Intertek. Reese's Law and ANSI/UL 4200A
• US Consumer Product Safety Commission. Button cell and coin battery business guidance