AirTag battery

An AirTag takes one CR2032 lithium 3 V coin battery, sold at most electronics and drug stores.^{[1 · Oct 29, 2026]}

How to replace it

1. Press down on the stainless steel battery cover and turn it counterclockwise until it stops.^{[1 · Oct 29, 2026]}
2. Lift off the cover and take out the old battery.^{[1 · Oct 29, 2026]}
3. Put in a new CR2032 with the positive (+) side facing up. You'll hear a sound when it connects.^{[1 · Oct 29, 2026]}
4. Line up the three tabs on the cover with the three slots, then turn it clockwise until it stops.^{[1 · Oct 29, 2026]}

Bitter-coated batteries

Some CR2032s have a bitter coating to discourage children from swallowing them. Apple suggests a bitterant-coated cell but warns that some may not work with AirTag; look for packaging that says "Compatible with Apple AirTag".^{[1 · Oct 29, 2026]}

When it's low

Your iPhone shows a notification when the battery is low. You can also open Find My, tap Items, then tap the AirTag; "Low Battery" appears under its name.^{[1 · Oct 29, 2026]}

Safety

Apple warns that the AirTag, its cover and its battery are a choking hazard for small children, and that a swallowed coin battery can cause internal chemical burns in as little as 2 hours.^{[1 · Oct 29, 2026]} If that may have happened, call the National Battery Ingestion Hotline at 1-800-498-8666.^{[2 · Oct 29, 2026]}

Sources: 1. Apple Support, Replace the battery in your AirTag. 2. National Capital Poison Center, Swallowed a button battery?. Checked Oct 29, 2026. Inch conversions are our own arithmetic from the millimeter figures. Brand names and trademarks belong to their owners; specs are restated in our own words and tables, not reproduced.