An AirTag battery lasts about one year under normal use

Apple's AirTag uses a standard CR2032 coin cell battery that typically runs for roughly one year before it needs replacement. The exact length depends on how often the AirTag communicates with your iPhone or other Apple devices—the more frequently it sends location data, the faster the battery drains. A tag you check on daily will deplete faster than one sitting in a desk drawer.

When the battery gets low, your iPhone sends you a notification saying the battery needs replacement. At that point, you have a small window—usually a few weeks—before the AirTag stops working entirely. The notification appears in the Find My app and also as a system alert on your lock screen.

Key Takeaways

  • AirTag batteries last approximately one year with typical daily use, though this varies based on how often the tag communicates.
  • Your iPhone notifies you when the battery is low, giving you time to replace it before the AirTag stops functioning.
  • Replacement is straightforward: pop off the white back cover and swap in a new CR2032 battery, which costs a few dollars at any pharmacy or electronics store.
  • Factors like frequent location checks, Bluetooth range searches, and cold temperatures can shorten battery life.
  • You cannot recharge an AirTag—the battery is disposable and designed to be replaced, not recharged.

What affects how fast the battery drains

Several real-world factors speed up or slow down battery drain. If you live in a cold climate, the battery will deplete faster because chemical reactions inside the cell slow down in low temperatures. An AirTag in a heated home will last longer than one left in a car during winter.

How often you search for the tag also matters. Each time you open Find My and check the location, the AirTag wakes up and transmits data. Someone who checks their keys five times a day will see faster drain than someone who checks once a week. Similarly, if you use the "Play Sound" feature frequently to locate a lost item, that drains the battery more than passive tracking.

The density of Apple devices around you plays a role too. In a city full of iPhones and other Apple hardware, your AirTag communicates more often because it's constantly being detected by nearby devices. In a rural area with fewer Apple devices, it communicates less and the battery lasts longer.

How to replace the battery yourself

Replacing an AirTag battery takes less than a minute and requires no tools. Hold the AirTag with the white plastic side facing up. Press down firmly on the white back cover and twist it counterclockwise about a quarter turn—you'll feel it loosen. Lift off the cover and remove the old CR2032 battery.

Insert the new CR2032 battery with the positive side (marked with a plus sign) facing up toward you. Replace the white cover by aligning it with the grooves and twisting clockwise until it clicks. Your AirTag will reconnect to your iPhone automatically within a few seconds.

CR2032 batteries are inexpensive and widely available. You can buy them at pharmacies, grocery stores, electronics retailers, or online for between two and five dollars. Buy a pack of several if you have multiple AirTags, since they all use the same battery type.

Signs the battery is running low

Your iPhone gives you clear warning before an AirTag dies completely. The Find My app shows a battery icon next to the AirTag's name, and when it reaches about 10 percent, the icon turns red. At the same time, you'll receive a notification on your lock screen saying "AirTag Battery Low" or similar language.

After you see this notification, you typically have two to four weeks before the AirTag stops responding entirely. This window gives you time to buy a replacement battery and swap it in. If you ignore the notification and the battery fully drains, the AirTag will not transmit location data or respond to Find My searches until you replace the battery.

Why AirTag uses a disposable battery instead of rechargeable

Apple chose a disposable CR2032 battery over a rechargeable one for practical reasons. Rechargeable batteries are thicker and heavier, which would make the AirTag larger and less convenient to attach to keys or slip into a wallet. A rechargeable design would also require a charging port or wireless charging coil, adding cost and complexity.

The CR2032 is one of the most common batteries in the world—it powers watches, calculators, hearing aids, and thousands of other small devices. This means replacement batteries are cheap and available everywhere. You don't need a special charger or proprietary accessory; you just buy a battery at any store and swap it in yourself.

Storing AirTags to preserve battery life

If you have an AirTag you're not using regularly, you can extend its battery life by removing the battery and storing it separately. This prevents the AirTag from draining power while sitting unused. When you're ready to use it again, straightforward reinsert the battery.

Store the battery in a cool, dry place. Extreme heat or humidity can damage the battery or cause it to leak. A desk drawer or closet works fine. Avoid leaving batteries in hot cars or damp basements for extended periods.

Frequently Asked Questions

Can I use a different battery type in my AirTag?

No. AirTag is designed specifically for CR2032 batteries. Using a different size or type could damage the device or cause the battery to leak. Stick with CR2032 replacements from any reputable brand.

Does cold weather really drain the battery faster?

Yes. Chemical reactions inside batteries slow down in cold temperatures, which reduces the voltage the battery can deliver. An AirTag left in a freezing car will drain noticeably faster than one kept at room temperature, though it will recover some capacity when warmed up.

What happens if I don't replace the battery when I get the notification?

The AirTag will continue to work for a few more weeks, but gradually weaken. Eventually it will stop transmitting location data and won't respond to Find My searches or sound alerts. You'll need to replace the battery to use it again.

Is there a way to check the exact battery percentage?

The Find My app shows the battery status as a colored icon but does not display an exact percentage. When the icon is green, the battery is healthy. When it turns red, replacement is due soon. This simplified display is intentional—Apple designed it to be straightforward rather than show precise numbers.

Do all AirTags use the same battery?

Yes. All AirTag models, including the standard AirTag and the AirTag Keychain, use CR2032 batteries. If you have multiple AirTags, you can use the same replacement battery type for all of them.