Button Batteries: The Hazard Most Parents Miss

A swallowed button battery can begin causing serious internal burns within about two hours, and there may be no obvious symptoms at first. If you suspect a child has swallowed one, this is a medical emergency — go straight to the emergency department. Do not wait to see if symptoms develop, do not induce vomiting, and do not give food or drink other than honey if advised.

Last updated: 1 August 2026 · Written by Atikur Rahman

Why they are so dangerous

It is not a poisoning or a choking risk in the usual sense. When a lithium coin battery lodges in the oesophagus, saliva completes the circuit and generates hydroxide, which burns through tissue chemically. The battery does not need to be new — a "dead" battery retains enough charge to do this.

The oesophagus sits against major blood vessels and the airway, which is why the consequences can be catastrophic and why time matters so much.

Where they are, and where people forget to look

• Remote controls, especially slim ones with sliding covers
• Car key fobs
• Bathroom and kitchen scales
• Musical and light-up greeting cards
• Thermometers
• Flameless candles and fairy lights
• Hearing aids — often a grandparent's
• Toys, particularly cheap or imported ones
• Fitness trackers and small electronics
• Loose in drawers, handbags and visitors' bags

The greeting card is the one most people have never considered.

Symptoms — and why you cannot rely on them

There may be none initially. When they appear, they are non-specific and easily mistaken for a virus:

• Drooling, or refusing food and drink
• Gagging, coughing or noisy breathing
• Chest or throat pain
• Vomiting, sometimes with blood
• Unexplained irritability or lethargy
• Fever

If you saw or suspect ingestion, act on that rather than on symptoms. Waiting for confirmation is what turns a manageable situation into a serious one.

What to do

1. Go to the emergency department immediately. Call 911 if the child is struggling to breathe.
2. Take the packaging or an identical battery if you have one — the size matters clinically.
3. Do not induce vomiting.
4. Do not give food or drink unless specifically told to.
5. Honey may be advised for children over 12 months if it will be more than a short time to hospital — some guidance supports it to coat the battery and slow the burn. Follow medical direction; never give honey under 12 months.
6. In the US, Poison Control is 1-800-222-1222. Save it in your phone now.

Batteries in the nose or ear are also emergencies and cause damage quickly.

Prevention

• Audit your home once, deliberately. Go device by device rather than room by room.
• Secure every compartment. A screw-secured cover is fine. Tape a slide cover.
• Store spares locked away, not in a kitchen drawer.
• Dispose of used batteries immediately and out of reach — bin them at a recycling point, not in a drawer.
• Check visitors' belongings and grandparents' homes, especially for hearing aids.
• Avoid cheap novelty items with unsecured compartments.

Frequently asked questions

How quickly can damage happen?

Serious injury can begin within about two hours. This is why it is treated as an emergency rather than a watch-and-wait.

What if the battery is dead?

Still dangerous. Residual charge is enough to generate the current that causes the burn.

What if it has passed into the stomach?

Still requires medical assessment. Doctors will decide based on size, age and location on X-ray.

Are all coin batteries equally risky?

Larger lithium cells, particularly 20mm ones like CR2032, are the most dangerous because they are more likely to lodge in the oesophagus.

What about older children?

Most cases are under six, but ingestion happens at any age, and hearing aid batteries put older adults at risk too.

Where to go from here

Our free printable babyproofing checklist lists button batteries in the top five hazards, alongside furniture tip-over and blind cords. The full Babyproofing Guide works through the house room by room. Browse all parenting guides.

This is general safety information and not a substitute for emergency medical care. If you suspect a child has swallowed a button battery, go to the emergency department immediately. In the US call 911 or Poison Control on 1-800-222-1222. In the UK call 999 or 111.