AirTag Battery Life: How Long It Lasts (and How to Extend It)

How long does an AirTag battery last?

Apple's spec is about 12 months on a single CR2032 lithium coin-cell, under "normal use." Real-world numbers usually land somewhere between 9 and 14 months. What pushes it up or down: how often Precision Finding gets triggered, how much Apple-device traffic the tag sees day to day, how cold the environment runs in winter, and what brand of CR2032 got installed.

The battery is user-replaceable — Apple built the product that way on purpose. When it's done, you pop in a fresh $1–$5 coin cell and the same AirTag keeps working. No new pairing, no re-linking, no replacement hardware.

What kind of battery does an AirTag use?

AirTags use a standard CR2032 3V lithium coin-cell battery — the same type used in many digital watches, car key fobs, and small electronics. CR2032s are widely available at pharmacies, grocery stores, electronics retailers, and online for about $1–$5 each.

Apple recommends CR2032 batteries without a "bitterant coating" (which is a safety coating some manufacturers add to deter children from swallowing them). The bitterant coating can sometimes interfere with the AirTag's battery contacts — so for best results, use a standard uncoated CR2032 from a reputable brand like Duracell, Energizer, Panasonic, or Sony.

How to replace an AirTag battery

1. Hold the AirTag with the stainless-steel back facing up.
2. Press down on the steel back and rotate it counterclockwise until it stops (about a quarter turn).
3. Lift off the steel cover to expose the battery.
4. Remove the old CR2032 — it should lift out easily.
5. Insert a fresh CR2032 with the positive (+) side facing up.
6. Listen for a short chime — this confirms the battery is working and the AirTag is active again.
7. Replace the steel cover by lining up the three tabs with the three slots and rotating clockwise until it locks into place.

What drains AirTag battery faster?

• Frequent Precision Finding — each Precision Finding session uses the U1/U2 ultra-wideband chip, which is more power-hungry than standard BLE advertising
• Heavy use of the AirTag speaker (playing sounds to locate it) — the onboard speaker draws more current than the radio
• Very cold temperatures — lithium coin-cell capacity drops in extreme cold, so AirTags in outdoor winter conditions may report lower battery sooner
• Low-quality or old CR2032 cells — stale batteries from bargain retailers may deliver far less than their rated capacity
• Counterfeit CR2032 cells from unverified online marketplaces — capacity is often a fraction of genuine batteries

How to check AirTag battery level

Apple does not display a precise percentage for AirTag battery. Instead, the Find My app on iPhone, iPad, or Mac shows a low-battery indicator next to the AirTag's name once the battery gets below a threshold (typically the last couple of months of life).

The iPhone will also push a notification when an AirTag's battery is getting low, so you do not need to manually check. The notification arrives well before the AirTag stops working, giving you time to replace the battery without losing tracking.

In TagLogger, low-battery status from connected AirTags surfaces in the same workflow as other AirTag status — so teams managing many tracked assets can see which ones need battery replacement without checking each AirTag individually.

How to extend Find My tag battery life to 3 or 6 years

Annual coin-cell swaps are fine for one or two tags. They stop being fine when you are swapping fifty a year across a fleet. The fix is a longer-life cell: the same Find My tag electronics in an IP68 sealed housing powered by a larger lithium cell instead of a CR2032.

There are two tiers. The Standard Tag runs on a CR2477 coin cell for up to 3 years and is the everyday choice for assets you would rather not touch for years at a time. The Extended Tag runs on two ER14250 lithium cells for up to 6 years and is built for set-and-forget deployments — outdoor equipment, long-cycle inventory, anything where a maintenance visit is expensive. The Extended Tag's lithium cells also handle cold storage better than a coin cell, which matters for anything outdoors year-round.

The rest of this section shows where that extra runtime comes from, what actually draws power from the cell, and the two independent ways the multi-year numbers check out.

Where the extra runtime comes from

Runtime starts with how much energy is in the cell. A Compact Tag, like an AirTag, runs on a single CR2032 coin cell — about 225 mAh of usable energy. The longer-life tags carry far more: the Standard Tag's CR2477 coin cell holds about 1,000 mAh, roughly 4.4 times as much, and the Extended Tag's pair of ER14250 lithium cells holds about 2,400 mAh combined, close to eleven times as much. Same radio, same firmware, a much bigger fuel tank.

Coin-cell capacity from the Energizer CR2032 datasheet; CR2477 and ER14250 capacities from the cells' published datasheets.

What actually draws power from the cell

A bigger cell only helps if the tag sips from it slowly, and an AirTag does. Most of its hardware is idle most of the time. The only continuous draw is the Find My beacon — a low-energy Bluetooth broadcast of the tag's rotating ID. Precision Finding (ultra-wideband), Play Sound (the speaker), and motion sensing all wake on demand, so for a tag that stays in place and is located through the network rather than by hand, they sit idle.

That is why a deployed tag's average draw, 15 to 23 microamps on the beacon alone, sits at or below the roughly 26 microamps implied by Apple's everyday rating. The slower the steady draw, the longer the same cell lasts.

Everyday draw is implied by Apple's published rating: about 225 mAh over roughly a year averages near 26 µA. The 15–23 µA figure is the beacon-only Bluetooth advertising duty cycle from published teardowns of the AirTag radio; third-party Find My tags in the same role draw comparably.

The runtime math, checked two ways

Runtime is just energy divided by draw — the two numbers above. Working it two independent ways guards against a bad assumption in either. One route divides the usable cell energy by the beacon-only draw, which puts the Standard Tag at about 4 to 6.5 years and the Extended Tag at about 10 to 15.5 years. The other simply scales Apple's own one-year rating by how much more energy the larger cells hold, landing near 4 years and 11 years. Both land past each tag's rated life.

The 15% trim covers cutoff voltage and self-discharge over multi-year storage.

Estimated years of service vs. the rating

Plotted against the 3- and 6-year marks, both longer-life options clear their rating with room to spare: the Standard Tag works out to roughly 4 to 6 years against its 3-year rating, and the Extended Tag to roughly 10 to 15 years against its 6-year rating. As a sanity check, the same energy-divided-by-draw formula, run on the AirTag's own 225 mAh coin cell, returns about 1 to 1.6 years — right around the one year Apple publishes. A method that reproduces Apple's number on a publicly documented cell is the same method behind the multi-year figures.

Figures assume the tag is located through the Find My network, with Precision Finding, Play Sound, and ultra-wideband unused. Each range reflects the spread between a conservative and an upper estimate of cell energy and draw.

AirTag battery life vs GPS trackers

When to replace an AirTag battery

Replace the battery when your iPhone sends a low-battery notification for the AirTag, or when Find My / TagLogger shows the low-battery indicator. Do not wait until the AirTag completely stops reporting — once it does, you lose the last-known location benefit for that window.

Many teams simply keep a small stock of CR2032s on hand and swap batteries preemptively each year at a predictable time (for example, at an annual inventory audit), so no tracked asset ever goes dark unexpectedly.

For teams running fleets, equipment tracking software for crews surfaces low-battery state across every tagged asset on one dashboard — so the annual swap becomes a planned maintenance window, not a scavenger hunt.