The AirTag battery comes out from the back and takes a standard CR2032 coin cell

An Apple AirTag uses one CR2032 coin cell battery, which you can buy at any drugstore, supermarket, or online retailer for $3 to $8. The battery lasts about one year of normal use. When the battery runs low, your iPhone will send you a notification, and the AirTag's Bluetooth range will shrink. You do not need tools, a computer, or any special knowledge—the battery compartment opens by hand in about five seconds.

The entire process takes less than a minute. You push down on the polished stainless steel back of the AirTag, twist it counterclockwise about a quarter turn, and the battery compartment pops out. Drop in a fresh CR2032 (the flat side faces up toward you), snap the compartment back in, and you are done. The AirTag will reconnect to your iPhone automatically.

Key Takeaways

  • You need one CR2032 coin cell battery, available at any pharmacy or grocery store for a few dollars.
  • Push down on the stainless steel back of the AirTag and twist counterclockwise to open the battery compartment.
  • Insert the new battery with the flat side facing up, then twist the compartment clockwise until it clicks back into place.
  • Your iPhone will automatically recognize the fresh battery and reconnect within seconds.

What you need before you start

Gather a CR2032 battery before you begin. These are standard coin cell batteries sold everywhere—check the pharmacy section, the checkout counter, or the electronics aisle of any drugstore or supermarket. Online retailers like Amazon ship them quickly if you prefer. You do not need a screwdriver, a coin, or any other tool. The AirTag is designed to open by hand.

If you have multiple AirTags, it is worth buying a pack of two or four batteries at once, since they all use the same size and you will eventually need replacements for the others. Batteries cost less per unit when you buy in bulk.

Step-by-step: opening the battery compartment

Hold the AirTag in one hand with the polished stainless steel back facing up. Place your thumb on the center of the metal back. Press down firmly—you should feel slight resistance. While pressing, twist your thumb counterclockwise (toward the left) about a quarter turn, roughly 90 degrees. You will hear or feel a small click.

The white plastic battery compartment will pop up slightly. Lift it away from the AirTag body. The compartment is a small white disc with a lip around the edge. Set the AirTag body aside on a clean surface so you do not lose it.

Removing the old battery and inserting the new one

Look inside the battery compartment. The old CR2032 battery sits in a small circular recess. If the battery is still there, tip the compartment gently or use your fingernail to pry the old battery out. It should come free easily. Discard it or recycle it according to your local battery recycling rules.

Take your new CR2032 battery and look at both sides. One side is flat and unmarked; the other side has text printed on it. Insert the battery with the flat side facing up (toward you). The printed side faces down into the compartment. Press gently until the battery sits flat in the recess. Do not force it—it should settle into place with light pressure.

Closing the compartment and reconnecting

Hold the battery compartment with the battery inside and align it with the opening on the AirTag body. The compartment has a small notch or alignment mark that matches a corresponding mark on the AirTag. Line these up so the compartment sits flush. Press down gently and twist clockwise (toward the right) about a quarter turn until you hear a click. The compartment should be snug and not wobble.

Your AirTag will reconnect to your iPhone within 10 to 15 seconds. Open the Find My app on your iPhone and tap Items. You should see your AirTag listed with a green dot, indicating it is connected. If it does not appear when ready, wait a few more seconds and refresh the app. The battery notification in the Find My app will clear once the system recognizes the fresh battery.

Common mistakes and how to avoid them

The most common error is inserting the battery upside down—with the printed side facing up instead of down. If your AirTag does not reconnect after you close the compartment, open it again and flip the battery. The flat side must face toward you when you look into the compartment.

Another mistake is not twisting the compartment far enough when closing it. If the compartment is loose or rattles, open it again and twist clockwise until you feel a firm click. A loose compartment can cause the battery to lose contact and the AirTag to stop working. Do not overtighten—a quarter turn is enough. If you twist too hard, you risk cracking the plastic.

Some people buy the wrong battery size by accident. Make sure the package says CR2032, not CR2025, CR2016, or any other variant. The numbers matter—a CR2025 is slightly thinner and will not make proper contact inside the compartment.

What to do if the battery compartment is stuck

If the compartment will not twist open, try again with a firmer push-and-twist motion. Press down on the center of the metal back with your thumb and explore steady pressure while twisting. Sometimes the compartment is straightforward tight from the factory, and a confident motion will free it. Do not use a tool or try to pry it open—you will damage the AirTag.

If the compartment still will not budge after two or three attempts, let the AirTag sit for a few minutes and try again. Occasionally the plastic can swell slightly in humid conditions. If it remains stuck after that, contact Apple Support. A stuck compartment is rare and usually indicates a manufacturing defect.

Frequently Asked Questions

How often do I need to change the battery?

Most AirTag batteries last about one year with normal use. Your iPhone will notify you when the battery is low, usually a few weeks before it dies completely. If you use the AirTag heavily—tracking a pet or a frequently-moved item—the battery may drain faster. Check the Find My app every few months to see the battery percentage.

Can I use a rechargeable CR2032 battery?

Rechargeable CR2032 batteries exist, but Apple does not officially recommend them. They have a lower voltage than standard alkaline CR2032 cells and may not power the AirTag reliably. Stick with standard alkaline CR2032 batteries from a reputable brand for the best results.

What happens if I put the battery in backwards?

If you insert the battery with the printed side facing up, the AirTag will not work. The battery will not make proper electrical contact. Open the compartment, flip the battery so the flat side faces up, and close it again. Your AirTag will reconnect when ready.

Do I need to reset the AirTag after changing the battery?

No. The AirTag will automatically reconnect to your iPhone within seconds of closing the battery compartment. You do not need to remove it from Find My or perform any manual reset. If it does not reconnect after 30 seconds, open the Find My app and refresh it.

Where is the cheapest place to buy CR2032 batteries?

Prices vary by location and retailer. Drugstores and supermarkets typically charge $4 to $8 per battery. Buying a pack of four or more online usually costs less per unit. Check Amazon, Walmart, Target, or your local pharmacy for current prices in your area.