Five hours per charge is Apple's stated rating for the AirPods 4, with the case getting you to thirty total. If your buds are conking out after two or three hours instead, or the case itself is running dry by midafternoon, you've got something actively draining them. The good news is that most of the culprits are software settings or quick cleanups, not dead cells.
Here's what to check, starting with the single most common cause for this specific model.
Update to the Latest Firmware Via the Bluetooth Menu
AirPods 4 firmware updates happen automatically when your buds are in the case, connected to power, and near your iPhone. But automatic doesn't mean instant. If you're seeing lower-than-expected battery life, force the check manually by making sure everything is in place.
Drop both buds in the case, close the lid, and plug the case into power with an Apple MFi-certified USB-C cable. Keep your iPhone nearby and connected to Wi-Fi. After about ten to fifteen minutes, open the lid near the phone, then go to Settings > Bluetooth, tap the blue i next to your AirPods 4, and look at the Firmware Version line. If a newer version exists, it should have downloaded by now. If not, leave the setup in place for another half hour. Apple doesn't let you trigger the update manually, but a fresh install often resolves battery drain bugs that shipped with the launch firmware.
Turn Off Spatial Audio When You Don't Need It
AirPods 4 support Spatial Audio with dynamic head tracking, and it's a real battery hog compared to standard stereo. The accelerometers and gyros in each bud stay active constantly to track your head position, even if the music isn't obviously shifting. If you're just listening to a podcast or a regular playlist, that processing is wasted runtime.
From your iPhone, go to Settings > Bluetooth, tap the i next to your AirPods 4, and scroll to Spatial Audio. Switch it to Off or Fixed (if you want the effect without head tracking). You'll see a meaningful improvement in per-charge runtime, often an extra 45 minutes to an hour.
Disable Automatic Ear Detection If It's Behaving Wrong
In-ear detection on the AirPods 4 uses a skin-contact sensor to know when a bud is in your ear. When it works right, it pauses audio when you remove a bud and resumes when you pop it back in. When it glitches, it can keep a bud active even when it's sitting in the case, or fail to wake it properly, causing uneven drain between left and right.
Open the AirPods 4 settings in Settings > Bluetooth > tap the i. Toggle Automatic Ear Detection off, then test the buds for a day. If the battery drain normalizes, the sensor was either dirty or misreading. You can turn the feature back on later, but a lot of users find they prefer it off for the predictability. With it off, you'll need to tap a bud manually to resume audio, but the battery becomes much more consistent.
Clean the Charging Contacts and the Lid Sensor
The AirPods 4 case has no Qi or MagSafe charging. It relies entirely on the metal contacts at the bottom of each stem and the corresponding pins inside the case wells. If those contacts are dirty, the buds don't charge fully overnight, and you start the day with a partial charge that looks full on the status light but drops fast. The same goes for the lid sensor. If the case can't tell whether the lid is closed, it may stay awake and drain the case battery while sitting idle.
Take both buds out. Use a dry microfiber cloth to wipe the gold contacts on the bottom of each stem. Then use a clean, dry cotton swab to gently rub the pins inside each charging well. For the lid sensor, use the corner of a microfiber cloth to clean the small detection magnet area near the hinge. Let everything air-dry for a minute, then put the buds back in and check the charge levels after five minutes in the case.
Reset the AirPods 4 (Full Factory Reset)
If the software side feels stuck or you've cycled through settings without improvement, a reset clears all the pairing data and internal states. The AirPods 4 reset sequence is different from earlier models. Close the case lid and wait 30 seconds. Open the lid. Then double-tap the front of the case three times. Time the taps carefully: the first tap while the status light is solid white, the second tap when the light flashes white, and the third tap when the light flashes faster. After the third tap, the light should flash amber, then back to white. That confirms the reset.
After the reset, you need to pair the AirPods 4 to your iPhone again. Open the case near the phone and tap Connect when the card appears. Your saved EQ and settings won't be restored, so you'll need to reconfigure Spatial Audio and other preferences. Battery behavior often returns to spec after a reset, particularly if you've been through several auto-update cycles that left the firmware in a weird state.
Limit Auto Switch to One Apple Device
Auto Switch lets your AirPods 4 hop between your iPhone, iPad, and Mac as you move between them. It's convenient, but it also keeps a low-power Bluetooth connection alive to each paired device, even when you're not actively using them. If you have three or four Apple devices, that adds up. On top of that, iOS 26 introduced a known delay bug with Auto Switch that can leave the buds listening for handoff signals longer than necessary.
Open Settings > Bluetooth on your iPhone and tap the i next to your AirPods 4. Scroll to Connect to This iPhone and set it to When Last Connected to This iPhone. Then go to each other Apple device you're signed into with the same Apple ID, and in that device's Bluetooth settings for the AirPods 4, set the same option. That effectively disables automatic switching. You'll have to manually select the AirPods 4 in each device's Bluetooth menu, but the battery savings are real.
Check the Case Charging Setup
The AirPods 4 case uses a USB-C port and works with standard 5W chargers. Apple doesn't advertise any fast-charge spec, so plugging it into a 20W iPad brick doesn't speed things up. However, if you're using a third-party USB-C cable that isn't MFi certified, the case may charge slowly or inconsistently, leading to a case that reads full but depletes faster than expected.
Use the Apple cable that came in the box, or any USB-C cable with clear MFi certification on the package. Plug it into a 5W or 12W USB power adapter (Apple's small square brick or a third-party equivalent). Let the case charge fully for at least two hours, then check the case battery level in the Batteries widget on your iPhone. If it shows 100%, do a real-world test with the buds inside to see if the case holds its charge over a full day.
Re-Pair Both Buds if One Is Draining Faster
If you check the battery widget and one AirPod consistently shows 20% or more lower than the other after the same usage, you've got an asymmetry issue. This is a known behavior on the AirPods 4 with older iOS versions, particularly iOS 17.x or early iOS 18 builds. One bud loses its connection state and stays in a higher-power listening mode while the other sleeps properly.
Remove the AirPods 4 from your account by going to Settings > Bluetooth, tapping the i, and choosing Forget This Device. Place both buds in the case, close the lid, wait 30 seconds. Open the case near your iPhone and tap Connect to re-pair fresh. Use the complete reset process described earlier if the forget-and-repair step doesn't balance the levels. This clears whatever internal state was telling one bud to work harder than the other.
Aging Cells Versus Software Drain
If your AirPods 4 are from the launch window in fall 2024 and you've used them daily for over a year, the cells themselves are losing capacity. Lithium-ion batteries this small degrade naturally with charge cycles. You'll notice runtime gradually shortening, not a sudden drop. If the case also seems to hold less charge than it used to, the cells in both the buds and case are aging together.
You can check the battery health by looking at the cycle behavior. Note what time you put the buds in your ears at 100% and note when they hit 10%. Compare that to the 5-hour rating. If you're getting 3 hours on a full charge with all the settings above optimized, the cells are probably done. Apple offers battery service for AirPods, but it often costs enough that buying a new set makes more practical sense. Check your warranty status in Settings > Bluetooth > tap the i next to your AirPods 4 first.
