How to Replace an AirTag Battery (Step-by-Step Guide)

Apple AirTags are designed to be simple to maintain — and replacing the battery is something most people can do in under a minute without any tools. But a few variables determine exactly what that process looks like for you, including which generation of AirTag you own, how you're alerted to a low battery, and whether the CR2032 battery you buy has a specific coating that can interfere with the process.

Here's everything you need to know.

What Battery Does an AirTag Use?

Every AirTag runs on a single CR2032 lithium coin battery — a widely available, inexpensive battery format used in everything from key fobs to medical devices. Apple designed the AirTag with user-replaceable batteries specifically so you wouldn't need to send it in for service.

Under typical use, a CR2032 battery in an AirTag lasts roughly one year, though actual life varies depending on:

• How frequently the AirTag plays sounds (triggered searches drain faster)
• Whether Precision Finding is used often (it uses the U1 chip, which draws more power)
• Ambient temperature — cold environments reduce battery life in most lithium cells
• The capacity of the specific CR2032 brand you install

How You'll Know the Battery Needs Replacing

Your iPhone handles the low-battery notification automatically. When the AirTag battery is running low, you'll see an alert in the Find My app and a notification on your iPhone's lock screen. There's no LED indicator on the AirTag itself — the system relies entirely on Bluetooth communication with your iPhone to surface that warning.

If you've ignored notifications for a while, the AirTag may stop appearing in Find My entirely, which typically means the battery is fully depleted.

Step-by-Step: How to Replace the AirTag Battery 🔋

What you need:

• A replacement CR2032 coin battery
• Clean, dry hands (no tools required)

Steps:

1. Hold the AirTag with the white side facing down — the shiny stainless steel side should be facing up toward you.

2. Press down on the steel cover with two or three fingers and rotate counterclockwise until the cover stops turning. Apple uses a twist-off mechanism similar to a childproof cap.

3. Lift off the steel back — it should separate cleanly from the white plastic housing.

4. Remove the old CR2032 battery — it sits loosely in the housing. Tip it out or lift it with a fingernail.

5. Insert the new CR2032 battery with the positive (+) side facing up — you should hear or feel a single chirp sound when the battery makes contact, confirming it's reading correctly.

6. Replace the steel cover by aligning the tabs and rotating clockwise until it locks into place. You'll feel it click.

That's the full process. No pairing reset required — the AirTag reconnects to Find My automatically.

The CR2032 Coating Problem

This is where many people run into unexpected trouble. Some CR2032 batteries have a bitterant coating — a thin layer applied to discourage children from swallowing them. This coating can prevent proper electrical contact inside the AirTag, meaning the device won't chirp or register as powered on even with a brand-new battery installed.

Apple acknowledged this issue. If your new battery isn't being detected:

• Try a different brand or batch of CR2032
• Look for batteries explicitly labeled as uncoated or confirmed compatible with AirTags
• Gently clean the battery contacts if you suspect residue, though this is rarely the root cause

Not all coated batteries cause this issue — it depends on coating thickness and formulation — but it's the most common reason a new battery appears to fail immediately.

Does Battery Brand or Quality Matter?

Name-brand CR2032 batteries from established manufacturers tend to offer more consistent capacity and fewer coating-related issues, but they're not the only option that works. What matters more than brand is freshness (check the expiration date) and coating status.

AirTag Generation and Battery Replacement

As of current models, all AirTags use the same twist-off battery mechanism and the same CR2032 format. If Apple releases updated hardware in the future, the replacement process could change — but for every AirTag currently in circulation, the steps above apply. 🔄

What Happens to Find My During the Swap?

Nothing, practically speaking. The AirTag doesn't need to be re-paired after a battery replacement. Once the new battery is seated and the chirp sounds, the device resumes normal operation. It will reappear in the Find My app as active, typically within a few minutes of coming back into range of your iPhone or any device in Apple's Find My network.

If it doesn't reappear after several minutes, try bringing it physically close to your iPhone. If it still doesn't register, the battery seating or a coating issue is the most likely cause — not a problem with the AirTag itself.

The Variables That Affect Your Specific Situation

The process is standardized, but outcomes vary depending on factors that differ from one user to the next: where you buy your replacement batteries, how old your stock is, whether the coating issue affects your batch, how frequently your particular AirTag gets used, and how quickly you act on the low-battery alert. Someone using an AirTag on a pet collar in a cold climate will burn through batteries differently than someone using one tucked into a rarely-moved bag. What works reliably for one setup may need a small adjustment for another.