Technically, AirTags are designed to use CR2032 batteries, not CR2025. While a CR2025 battery may physically fit, it is not recommended because it delivers less power and has a thinner profile, which can lead to poor contact, shorter lifespan, and unreliable performance.
Let’s look at the differences and why the CR2032 is the correct and safest choice for AirTags.
Official Battery Type for AirTags
Apple specifies that each AirTag uses a CR2032 lithium coin cell battery.
Official specs:
- Battery type: CR2032
- Voltage: 3 volts
- Thickness: 3.2 mm
- Diameter: 20 mm
- Typical lifespan: About 1 year
This is the exact battery size and voltage the AirTag’s design and contact points are built for.
Difference Between CR2032 and CR2025
Both batteries are similar in size and voltage but differ in thickness and capacity.
| Battery Type | Voltage | Diameter | Thickness | Capacity (approx.) | Compatible with AirTag? |
|---|---|---|---|---|---|
| CR2032 | 3V | 20 mm | 3.2 mm | 220–240 mAh | ✅ Yes (official battery) |
| CR2025 | 3V | 20 mm | 2.5 mm | 150–170 mAh | ⚠️ Not recommended |
The CR2025 is 0.7 mm thinner, which means it may not make solid electrical contact inside the AirTag. Even if it works temporarily, you may experience:
- Unstable power connection
- Shorter battery life
- Inconsistent tracking performance
- Random disconnections or resets
Why You Should Avoid CR2025 in AirTags
- Loose Fit
The thinner CR2025 might not press firmly against the contact points, especially after movement or vibration inside luggage or keychains. - Reduced Battery Life
Because it has less capacity, it will drain faster-sometimes lasting only a few weeks or months instead of a year. - Risk of Intermittent Failures
The AirTag may appear offline or disconnected due to poor battery contact, even when the battery isn’t fully drained. - Potential for Damage
Forcing the thinner battery to stay in place can strain or bend the contact clips inside the AirTag.
The Right Way to Replace an AirTag Battery
- Open the AirTag:
Press and twist the stainless-steel cover counterclockwise until it stops. - Remove the old battery.
- Insert a new CR2032 battery, positive (+) side facing up.
- Wait for a sound confirming successful contact.
- Close and twist the cover clockwise to lock it.
Battery Recommendations
- Use high-quality CR2032 lithium batteries from brands like Energizer, Panasonic, or Sony.
- Avoid bitterant-coated batteries (often labeled as “child-safe”) since the coating can block electrical contact with the AirTag’s terminals.
- Store spare batteries in a cool, dry place and avoid touching both sides to prevent corrosion.
Summary
| Feature | CR2032 | CR2025 |
|---|---|---|
| Designed for AirTag | ✅ Yes | ❌ No |
| Voltage | 3V | 3V |
| Thickness | 3.2 mm | 2.5 mm |
| Battery Life | ~1 year | A few months |
| Fit and Contact | Perfect | Loose/inconsistent |
| Recommended by Apple | ✅ Yes | ❌ No |
In short, while a CR2025 battery might power an AirTag temporarily, it’s not reliable or recommended. For the best performance, stability, and full one-year battery life, always use the CR2032 coin cell battery specified by Apple.