How to Replace the Battery in an AirTag

Apple's AirTag trackers are built to last — but not forever on a single charge. At some point, that small coin cell battery inside will need swapping out. The good news: replacing an AirTag battery is one of the few genuinely user-serviceable tasks Apple has built into its ecosystem. No tools required, no service appointment needed.

Here's everything you need to know about how it works, what affects the process, and what to watch for depending on your situation.

What Battery Does an AirTag Use?

Every AirTag runs on a CR2032 lithium coin cell battery — the same type found in many car key fobs, watches, and small electronics. This is a widely available, inexpensive battery sold at most grocery stores, pharmacies, electronics retailers, and online.

Apple rates the original battery for approximately one year of use under typical conditions. That estimate assumes standard Bluetooth pinging activity and occasional Precision Finding use. Heavy use — frequent location checks, regular Precision Finding with Ultra Wideband — can shorten that lifespan. Leaving an AirTag stationary for months at a time tends to extend it.

When the battery gets low, your iPhone will notify you through the Find My app. You'll see a low battery indicator next to the AirTag's name before it stops working entirely.

Step-by-Step: How to Replace an AirTag Battery

The replacement process is straightforward and takes about 30 seconds once you've done it once. 🔋

What you need:

• A new CR2032 battery
• Clean, dry hands (or a soft cloth for grip)

Steps:

1. Hold the AirTag with the stainless steel side facing up — that's the shiny, circular back panel.
2. Press down firmly on the steel back using two or three fingers.
3. Rotate the back panel counterclockwise until it stops. You only need to turn it a short distance — roughly a quarter turn.
4. Lift the back panel off to reveal the battery compartment.
5. Remove the old CR2032 battery by tipping it out or using a fingernail to pop it loose.
6. Insert the new battery with the positive side (+) facing up — the side with text on it should be visible.
7. Replace the back panel, press down, and rotate clockwise until it clicks and locks into place.
8. Listen for a sound from the AirTag — it will chime to confirm the battery connection is live.

If the AirTag doesn't chime after reinsertion, check that the battery is seated correctly with the positive side up, and that the back panel is fully locked.

One Important Caveat: Bitterant-Coated Batteries

Some CR2032 batteries are coated with a bittering agent (typically denatonium) — a safety measure to deter children from swallowing them. This coating can interfere with the AirTag's battery contacts and prevent a proper electrical connection.

If you insert a new battery and the AirTag doesn't chime or respond, the bitterant coating is often the culprit. In that case:

• Try a different brand of CR2032 without the coating
• Or gently clean the battery contacts with a dry cloth before reinsertion

This is a known compatibility quirk, not a defect in your AirTag. Apple has acknowledged the issue, and non-coated CR2032 batteries work reliably.

Does Battery Brand or Quality Matter?

For a device as low-power as an AirTag, battery quality does have a measurable effect — though not always a dramatic one.

Most users won't notice a difference between name-brand and quality generic batteries. Where it matters more is in extreme temperature environments — cold weather degrades battery performance noticeably, and a lower-capacity battery will feel that more quickly. If you're using an AirTag on ski gear, a pet that spends time outdoors in winter, or luggage traveling through cargo holds, battery chemistry becomes more relevant.

How Often Will You Actually Replace It?

That depends on how you use the AirTag. 📍

• Low-activity use (tracking a rarely moved item like luggage or a spare key): Battery may last well beyond a year
• Active daily use (a pet collar, a bag you check frequently, a bike): Expect to replace closer to the 12-month mark
• Heavy Precision Finding use: The Ultra Wideband chip draws more power; frequent use of the directional finding feature shortens the cycle

Your iPhone will alert you before it becomes a problem, so there's no need to track replacement dates manually.

What Happens If You Don't Replace It in Time?

An AirTag with a dead battery stops transmitting entirely. It won't appear in Find My, won't ping when prompted, and won't register its location. The device itself is fine — a fresh CR2032 will bring it back to full function immediately.

There's no memory loss, no re-pairing process, and no reconfiguration needed after a battery swap. The AirTag reconnects to your Apple ID automatically once powered back on.

The Variables That Change Your Experience

The replacement process is the same for every AirTag — but a few factors shape how smooth it goes and how long batteries last for you specifically:

• How often you actively locate the AirTag via the app
• The climate where it's used (cold degrades CR2032 performance)
• Which battery brand you purchase and whether it carries a bitterant coating
• How securely you reseat the back panel (an improperly locked cover can cause intermittent connection issues)

Someone tracking a dog in a cold-weather region who uses Precision Finding daily will have a very different battery lifespan than someone who drops an AirTag in a drawer as a backup tracker. The hardware and replacement steps are identical — what changes is how quickly you'll be doing it again.