An AirTag uses a standard CR2032 coin cell battery

Your AirTag runs on a single CR2032 battery, a flat, round coin-shaped cell about the size of a dime. This is one of the most common battery types you can find—drugstores, supermarkets, and hardware stores all stock them. Apple rates the battery to last roughly one year under normal use, though the actual lifespan depends on how often your AirTag sends location updates.

The CR2032 is a lithium battery rated at 3 volts. It costs between $3 and $8 for a single battery, or you can buy multipacks for less per unit. When the battery runs low, your iPhone will send you a notification telling you it's time to replace it—you don't have to guess or check manually.

Key Takeaways

  • AirTags use a CR2032 coin cell battery, available at most retailers for a few dollars.
  • The battery typically lasts about one year, though heavy use or cold temperatures can shorten that time.
  • Your iPhone will notify you when the battery is low, so you won't be caught off guard.
  • Replacing the battery takes less than a minute and requires no tools—just twist the back of the AirTag open.
  • The CR2032 is a standard lithium battery, not rechargeable, so you dispose of the old one and install a fresh one.

How to replace the battery yourself

Replacing an AirTag battery is straightforward and takes about 30 seconds. Hold the AirTag with the white plastic side facing up. Locate the stainless steel back—it's the shiny metal side. Press down on the steel back and twist it counterclockwise about a quarter turn until it stops. The back will pop off in your hand.

Inside you'll see the old CR2032 battery sitting in a small metal holder. Lift it out, note which side was facing up (the positive side, marked with a +, should face toward you), and drop in the new CR2032 with the positive side up. Replace the steel back by pressing it down and twisting clockwise until it clicks. Your AirTag will chime to confirm the battery is installed correctly.

If the AirTag doesn't chime, the battery may be inserted upside down. Pop the back off again and flip the battery 180 degrees. You don't need any tools, and there's no risk of damaging the AirTag during this process—Apple designed it to be user-replaceable.

Where to buy CR2032 batteries

CR2032 batteries are sold almost everywhere. Check the battery aisle at drugstores like CVS or Walgreens, supermarkets, Target, Walmart, and hardware stores. Amazon and other online retailers also carry them, often in bulk packs. If you're in a hurry, a local pharmacy or convenience store will have them.

Prices vary slightly by brand and quantity. A single battery might cost $4 to $8, but a pack of four or more usually brings the per-battery cost down to $1 to $3 each. Name brands like Energizer and Duracell are widely available, as are store brands, which perform identically for AirTag use.

Battery life and what affects it

Apple's one-year estimate assumes typical use—meaning your AirTag is in a bag or on a keychain and you're checking its location occasionally. If you use the Find My app constantly or enable Precision Finding frequently, the battery will drain faster. Cold temperatures also reduce battery life; a CR2032 in a freezing environment won't last as long as one at room temperature.

The AirTag itself doesn't have an on/off switch, so the battery is always powering the Bluetooth chip. Even when you're not actively using Find My, the AirTag is broadcasting its location to nearby Apple devices in the background. This constant low-level activity is why the battery lasts months rather than years, but still longer than many people expect.

Why Apple chose the CR2032

The CR2032 is one of the most widely available batteries in the world. Apple selected it because you can replace it yourself without special tools, and you can find a replacement almost anywhere without ordering online or waiting for delivery. This design choice means you're never stuck with a dead AirTag—you just need to find a battery, which takes minutes in most cases.

The battery is also small and lightweight, which keeps the AirTag compact and straightforward to attach to keys or slip into a wallet. A rechargeable battery would add bulk, weight, and complexity, and would require you to charge the AirTag regularly—something Apple decided would be more inconvenient than swapping a battery once a year.

Disposing of old CR2032 batteries

CR2032 batteries are lithium cells and should not go in regular trash. Most retailers that sell batteries also accept old ones for recycling—ask at the customer service desk. Best Buy, Home Depot, and many drugstores have battery recycling programs. Some municipalities also have hazardous waste collection days where you can drop off batteries for free.

If you have only one or two old batteries, you can also check Earth911.com or Call2Recycle.org to find a nearby drop-off location. The process is free and takes a few minutes. Recycling keeps lithium out of landfills and recovers materials that can be reused.

Frequently Asked Questions

Can I use a rechargeable CR2032 battery in my AirTag?

Rechargeable CR2032 batteries exist, but they output 1.5 volts instead of the standard 3 volts. Your AirTag is designed for 3-volt lithium cells and may not work reliably with a rechargeable version. Stick with standard disposable CR2032 batteries to avoid problems.

What happens if I put the battery in upside down?

The AirTag won't chime, and it won't work. The battery holder is designed so that only the correct orientation allows the contacts to touch. If you don't hear a chime after closing the back, open it again and flip the battery 180 degrees. Once it's correct, the AirTag will chime when ready.

How do I know when the battery is actually dead?

Your iPhone will send you a notification when the battery is low, giving you time to replace it before it dies completely. If you ignore the notification, the AirTag will eventually stop broadcasting and you won't be able to locate it. Replace the battery as soon as you see the alert.

Is there any way to extend battery life?

Using Precision Finding less often and checking Find My less frequently will help the battery last longer. Keeping your AirTag at room temperature also helps—cold drains batteries faster. Beyond that, there's no setting to adjust; the battery life is determined by the hardware design.

Can I buy AirTags with batteries already installed?

Yes. New AirTags come with a CR2032 battery already inside and ready to use. The battery is fresh from the factory, so you get the full one-year lifespan from the moment you set up the AirTag in the Find My app.