AirPods use a lithium-ion battery, not a lithium metal battery
Yes, AirPods contain a lithium-ion battery—the same type found in most phones, laptops, and wireless devices. This is different from a raw lithium or lithium metal battery. The lithium-ion chemistry allows the battery to recharge hundreds of times, which is why you can use AirPods for years by charging them in their case.
Each AirPod holds a small lithium-ion cell, and the charging case contains a larger one. The batteries are sealed inside and cannot be removed or replaced by the user. When the battery inside an AirPod or case fails after several years of use, the entire unit must be replaced.
Apple does not publish the exact capacity in milliamp-hours (mAh), but third-party teardowns have found that each AirPod contains roughly 40 to 60 mAh, depending on the model. The case holds between 400 and 1,000 mAh depending on which AirPods you own.
Key Takeaways
- AirPods use lithium-ion batteries, which can be recharged hundreds of times before they degrade.
- The battery is sealed inside each AirPod and the case; you cannot open or replace it yourself.
- Lithium-ion batteries lose capacity over time—after two to three years of daily use, you may notice shorter battery life.
- If the battery fails, Apple will replace the AirPods or case, though the cost is usually between $50 and $100 depending on the model.
How lithium-ion batteries work in AirPods
A lithium-ion battery works by moving lithium ions back and forth between two terminals (called the anode and cathode) through a chemical medium. When you charge AirPods, lithium ions move one direction; when the AirPods are in use, they move the other way, creating electrical current that powers the device.
This design is more efficient than older alkaline batteries because it can be recharged many times. A single charge cycle happens each time the battery goes from full to empty. Most lithium-ion batteries in consumer devices are rated for 300 to 500 full charge cycles before capacity drops noticeably.
The case itself acts as a portable charger. When you place AirPods inside, metal contacts on the AirPods touch contacts inside the case, and power flows from the case battery to the AirPods battery. The case recharges when you plug it into a USB-C or Lightning cable (depending on your model).
Battery life and how it changes over time
New AirPods typically last between 4 and 6 hours on a single charge, depending on the model and what you are doing. The case extends total listening time to 24 to 30 hours before you need to plug it in. These numbers assume normal use—heavy use or cold temperatures reduce battery life.
After one to two years of regular charging, you may notice the battery drains faster. This is normal. Lithium-ion batteries lose roughly 2 to 3 percent of their capacity per year under typical conditions. After three years, you might get only 80 percent of the original battery life. After five years, the battery may be noticeably weak.
You cannot slow this process significantly, but you can avoid speeding it up. Keeping AirPods at room temperature, avoiding complete discharges, and not leaving them in direct sunlight all help. Charging them every day is fine and does not damage the battery faster than occasional use would.
What happens when the battery fails
When a lithium-ion battery reaches the end of its life, it will no longer hold a charge. You may notice the AirPod dies within minutes of being removed from the case, or the case itself stops charging. At this point, the battery has degraded beyond practical use.
Apple offers battery replacement through its support program. You can contact Apple Support, visit an Apple Store, or use Apple's mail-in repair service. The cost varies by model but typically ranges from $50 to $100 per AirPod or case. Repair time is usually one to two weeks if you mail them in, or same-day if you visit a store.
Third-party repair shops also offer battery replacement for AirPods, often at a lower cost. However, opening AirPods requires specialized tools and skill, so the quality and warranty vary widely. If you choose this route, research the shop's reputation first.
Lithium-ion safety in AirPods
Lithium-ion batteries are safe when used normally. They are designed with internal safeguards to prevent overcharging, overheating, and short circuits. The case and each AirPod have built-in circuits that stop charging once the battery is full.
Do not attempt to open an AirPod or case to access the battery. The battery is glued in place, and opening the device can damage the electronics or cause the battery to fail suddenly. If an AirPod feels hot, swollen, or is leaking, stop using it and contact Apple.
When AirPods reach the end of their life, dispose of them at an electronics recycling center rather than in the trash. Lithium-ion batteries contain materials that can be recovered and reused, and throwing them away is illegal in many places.
Comparing AirPods battery life across models
Apple makes several AirPods models, and battery life varies between them. AirPods Pro last up to 6 hours per charge with active noise cancellation on, or up to 8 hours with it off. Standard AirPods last up to 6 hours. AirPods Max, the over-ear model, last up to 20 hours.
The case extends total listening time. AirPods Pro and standard AirPods reach about 30 hours total with the case. AirPods Max do not come with a case that charges them; instead, they charge via a USB-C cable built into a Smart Case.
Battery capacity does not tell the whole story. A larger battery does not always mean longer battery life if the device uses more power. AirPods Pro use more power because of the active noise cancellation feature, which is why they last slightly less time per charge than standard AirPods despite having similar battery size.
How to check your AirPods battery health
You can see the current battery percentage of your AirPods on your iPhone or iPad. Open the case near your device, and a battery status card appears on the screen showing the charge level of each AirPod and the case. You can also check battery in Settings under Bluetooth by tapping the information icon next to your AirPods name.
Apple does not provide a tool to check the overall health of the battery—how much capacity it has lost over time. To estimate this, compare your current battery life to the original specs. If your AirPods last noticeably less than half the original time per charge, the battery has degraded significantly.
Some third-party apps claim to show battery health, but they estimate based on usage patterns and are not always accurate. The most reliable way to know if your battery is failing is to notice that the AirPods no longer last through a typical day of use.
Frequently Asked Questions
Can I replace the battery in my AirPods myself?
No. The battery is glued inside the AirPod, and opening it requires specialized tools and skill. Attempting to do so will likely damage the device permanently. Apple and authorized repair shops are the safest option.
Is it bad to leave AirPods charging overnight?
No. The charging circuit stops power flow once the battery is full, so leaving them plugged in does not damage the battery. However, keeping any lithium-ion battery at 100 percent for extended periods does cause very slow degradation over months or years.
Why do AirPods get hot while charging?
Slight warmth during charging is normal. The battery generates heat as current flows through it. If the AirPods or case become too hot to touch, stop charging and contact Apple, as this may indicate a battery fault.
How long do AirPods batteries last before I need to replace them?
Most users notice significant battery degradation after two to three years of daily use. After four to five years, the battery may be too weak for practical use. This timeline varies based on how often you charge them and the conditions you store them in.
What should I do if my AirPods battery swells or leaks?
Stop using them when ready and do not attempt to charge them. A swollen or leaking battery is a sign of internal failure. Place the AirPods in a safe location away from flammable materials and contact Apple Support to arrange a replacement.