AirTags run for about one year on a single CR2032 battery before the battery drains completely

An AirTag uses one CR2032 coin cell battery, the same type found in watches, calculators, and car key fobs. Under normal use — meaning you carry it in a bag or attach it to keys and check its location occasionally through the Find My app — the battery lasts roughly 12 months. The exact length depends on how often you trigger the speaker, play sounds to locate the tag, or use the Precision Finding feature on newer iPhones.

Apple does not publish a precise drain rate because it varies by usage pattern. Someone who checks their AirTag's location once a week will see longer battery life than someone who plays the speaker sound multiple times daily. The battery does not die suddenly — your iPhone will send you a notification when the battery is low, giving you time to buy a replacement before the tag stops working.

When the battery dies, the AirTag itself does not break. You straightforward open the back, pop out the old CR2032, and insert a new one. The process takes about 30 seconds and costs between $3 and $8 for a replacement battery at any pharmacy, grocery store, or electronics retailer.

Key Takeaways

  • A CR2032 battery in an AirTag lasts approximately one year under typical daily use.
  • Battery life shortens if you frequently use the speaker or Precision Finding features, which draw more power than passive location tracking.
  • Your iPhone sends a low battery notification before the AirTag stops working, so you have time to replace it.
  • Replacing the battery takes 30 seconds and costs a few dollars — you do not need to buy a new AirTag.
  • CR2032 batteries are widely available at pharmacies, grocery stores, and online retailers.

What drains an AirTag battery fastest

The speaker feature is the single biggest battery drain. Every time you play a sound to locate your AirTag — either through the Find My app or by asking Siri — the battery uses noticeably more power than it would sitting idle. If you play sounds several times a week, you may see battery life drop to 8 or 9 months instead of 12.

Precision Finding, available on iPhone 11 and newer, also consumes more battery than standard location tracking. This feature uses your phone's camera and sensors to point you toward the AirTag in real time. Using it occasionally does not significantly shorten battery life, but frequent use throughout the day will reduce the overall lifespan.

Normal location tracking — checking where your AirTag is through the Find My app without playing sounds — uses very little battery. The tag communicates with nearby Apple devices to report its location, but this happens in the background and draws minimal power. You can check your AirTag's location dozens of times per month without noticing any impact on battery life.

How to know when your AirTag battery is running low

Your iPhone automatically notifies you when an AirTag's battery reaches a low level. The notification appears in the Find My app and as a system alert on your phone. Apple does not specify the exact percentage at which this alert triggers, but it typically arrives when the battery has 10 to 20 percent charge remaining.

You can also check the battery status manually by opening the Find My app, tapping the Items tab, selecting your AirTag, and looking at the battery indicator. The display shows either a percentage or a straightforward low-battery warning. Unlike some devices, AirTags do not show a detailed battery percentage in real time — you see either "OK" or "Low Battery".

If you ignore the low battery notification and the AirTag's battery dies completely, the tag will no longer report its location through Find My. However, if someone else with an Apple device passes near it, their device can still detect it and report the location to you — this is part of Apple's Find My network. The tag itself is not damaged and will work again as soon as you replace the battery.

Replacing the battery yourself

To replace an AirTag battery, hold the tag in one hand and press down on the stainless steel back cover with the other. Twist counterclockwise until you hear a click — the cover will pop off. Remove the old CR2032 battery and note which side was facing up (the positive side, marked with a plus sign, should face toward you).

Insert the new CR2032 battery with the positive side facing up, then place the cover back on and twist clockwise until it clicks. The AirTag will emit a sound to confirm the battery is installed correctly. If you do not hear a sound, the battery may not be seated properly — remove the cover and try again.

You do not need to re-pair the AirTag with your iPhone or reset anything. As soon as the new battery is in place, the tag will resume working and reporting its location through Find My. The battery replacement does not affect any of your saved locations or settings.

Where to buy replacement CR2032 batteries

CR2032 batteries are one of the most common battery types and are sold almost everywhere. Pharmacies like CVS and Walgreens stock them in the health and beauty section or near the checkout counter. Grocery stores typically carry them in the pharmacy or electronics aisle. Target, Walmart, and other general retailers have them in the electronics or battery section.

Online retailers including Amazon, Best Buy, and eBay sell CR2032 batteries in bulk or single packs. Buying a multi-pack (usually 4 to 10 batteries) costs less per battery than buying one at a time, and it makes sense if you own multiple AirTags or other devices that use the same battery type. A single CR2032 costs $3 to $5 at most retailers, while a pack of 5 to 10 typically costs $8 to $15.

Make sure you are buying a CR2032 and not a similar-looking battery like a CR2025 or CR2016. The number refers to the battery's dimensions, and using the wrong size will not fit in the AirTag. Check the package label before you buy.

Tips to extend AirTag battery life

Minimize use of the speaker feature if you want to stretch battery life beyond 12 months. Instead of playing sounds to find your AirTag, rely on the Find My app to show you its last known location. If you need to locate it physically, use Precision Finding on a newer iPhone rather than playing the speaker sound repeatedly.

Keep your AirTag at room temperature when possible. Extreme heat or cold can reduce battery performance temporarily, though this is rarely an issue for tags carried in bags or pockets. Storing an AirTag in a hot car or freezing garage for extended periods may cause the battery to drain faster, but normal daily temperature changes have no meaningful effect.

There is no way to "charge" an AirTag — it does not have a rechargeable battery. Once the CR2032 is depleted, you must replace it. Some people mistakenly look for a charging cable or port, but AirTags are designed to be straightforward and maintenance-free except for the annual battery swap.

Frequently Asked Questions

Can I use a rechargeable CR2032 battery in my AirTag?

Rechargeable CR2032 batteries exist, but they are not recommended for AirTags. Rechargeable versions have a lower voltage than standard alkaline CR2032 batteries, and AirTags are designed to work with standard alkaline batteries. Using a rechargeable battery may cause the tag to malfunction or drain faster. Stick with standard alkaline CR2032 batteries.

What happens if my AirTag battery dies while I am traveling?

If your AirTag's battery dies while you are away from home, the tag will stop reporting its location through your Find My app. However, if another Apple device user passes near it, their device can detect it and send you the location. Once you return home or reach a place where you can buy a CR2032 battery, you can replace it and the AirTag will resume normal operation.

Do all AirTags use the same battery?

Yes, all AirTag models use a CR2032 battery. Whether you own the original AirTag, the newer version, or an AirTag Slim, they all take the same battery type. This makes replacement straightforward and consistent across the product line.

Will my AirTag work if the battery is partially drained?

Yes, an AirTag continues to work normally until the battery is nearly empty. You will not notice any change in performance or location accuracy as the battery drains. The low battery notification gives you plenty of warning before the tag stops working entirely.

How much does it cost to replace an AirTag battery versus buying a new AirTag?

A CR2032 battery costs $3 to $8, while a new AirTag costs $29. Replacing the battery is far more economical and takes only 30 seconds. There is no reason to buy a new AirTag unless the tag itself is physically damaged.