How to Replace the Battery in an AirTag

Apple's AirTag uses a CR2032 coin cell battery — a common, widely available size that powers the tracker for roughly a year under typical use. When the battery runs low, your iPhone will notify you through the Find My app, giving you plenty of warning before the AirTag goes dark. Replacing it takes under a minute and requires no tools.

Here's exactly how it works, plus the variables that can affect your experience.

What Battery Does an AirTag Use?

AirTags run on a CR2032 lithium coin cell battery. This is the same battery type used in car key fobs, watches, and many small electronics. It's sold at pharmacies, grocery stores, electronics retailers, and online — generally inexpensive and easy to find.

One important note: some CR2032 batteries have a bitter coating (bitterant) applied to the surface as a child safety measure. Apple has confirmed that certain coated CR2032 batteries can interfere with proper contact inside the AirTag, preventing the device from powering on. If your replacement battery doesn't seem to work after installation, the coating is the most likely culprit. Look for uncoated CR2032 batteries or check the packaging — some brands label this explicitly.

Step-by-Step: How to Open and Replace the AirTag Battery 🔋

The AirTag's battery compartment uses a twist-off design — there's no screwdriver required.

1. Hold the AirTag with the stainless steel side facing up (the shiny metal back, not the white plastic front).
2. Press down on the steel back with two or three fingers and rotate counterclockwise until the panel stops — about a quarter turn.
3. Lift the steel cover off to reveal the battery sitting inside.
4. Remove the old CR2032 battery — it simply lifts out.
5. Drop in the new CR2032 battery with the positive (+) side facing up — the side with the text printed on it should be visible when seated.
6. Replace the steel cover by lining up the tabs and pressing down while rotating clockwise until it clicks into place.

When the new battery is seated correctly, you'll hear a chime — a short sound confirming the AirTag has powered back on and is functioning. No chime usually means the battery isn't making proper contact, or you have one of the coated batteries mentioned above.

How Do You Know When the Battery Needs Replacing?

Your iPhone handles the monitoring automatically. When the battery drops to a low level:

• A notification appears in the Find My app on your paired iPhone
• The AirTag's battery status is visible under Find My → Items → [your AirTag name] → Battery

There's no percentage readout — it's a simple low/not-low indicator. Apple's general estimate of one-year battery life assumes typical tracking use, meaning periodic location pings and occasional Precision Finding sessions. Real-world battery life varies depending on how actively the AirTag is used.

Variables That Affect Your Replacement Experience

Replacing an AirTag battery is straightforward in most cases, but a few factors can change the experience:

The physical process is the same across all AirTag generations (there has only been one design as of the current lineup), but the software side — notifications, battery status display — depends on having a reasonably current version of iOS and an active Find My configuration.

What If the AirTag Doesn't Work After Replacing the Battery?

If you install a fresh battery and get no chime, try these checks before assuming the battery is bad:

• Confirm the + side is facing up — this is the most common mistake
• Try a different brand of CR2032 — coated batteries are a known issue
• Reseat the battery — press down gently to ensure full contact before closing the cover
• Check that the cover is fully locked — an incomplete twist can prevent contact

If none of those resolve it, the battery itself may be dead (coin cells occasionally ship depleted) or there's a hardware issue with the AirTag. In that case, Apple Support or an Apple Store can assess whether the device has a defect.

A Note on Battery Life Expectations 🕐

Apple's one-year estimate is a general benchmark, not a guarantee. AirTags that are frequently pinged through the Find My network, used heavily with Precision Finding (the U1 chip-powered close-range locating feature), or subjected to extreme temperatures will drain faster. Conversely, an AirTag sitting in a bag that rarely moves may stretch well beyond a year.

This means your actual replacement interval depends on your specific use case — how the AirTag is used, where it travels, and how often you actively locate it all factor into how long any given battery lasts in your situation.