The most common reason: a dirty charging contact
Your left AirPod won't charge because the metal contacts that touch the case are dirty or corroded. This is the cause in roughly 8 out of 10 cases where one AirPod charges and the other does not. The contacts are tiny — smaller than a pencil eraser — and they sit on the bottom of each AirPod. When they get blocked by lint, earwax, or dried sweat, the case cannot send power to the AirPod.
You can see these contacts if you look at the bottom of your AirPod under bright light. They are two small gold or silver dots. If they look dull, dark, or have a white or green film on them, they need cleaning. This happens faster if you keep your AirPods in a pocket with lint, or if you wear them during exercise.
The fix takes two minutes. Use a dry cotton swab or a soft, dry cloth to gently rub the contacts on the bottom of the left AirPod. Then rub the matching contacts inside the charging case where the AirPod sits. Do not use water, rubbing alcohol, or any liquid — moisture can damage the AirPod. After cleaning, place the AirPod back in the case and wait five minutes to see if the charging light appears.
Key Takeaways
- Dirty metal contacts on the AirPod and inside the case are the most common reason one AirPod stops charging while the other works fine.
- Clean the contacts with a dry cotton swab or soft cloth — never use water or liquid, which can cause permanent damage.
- If cleaning does not work, the AirPod battery itself may have failed and the AirPod will need to be replaced.
- A faulty charging case can also prevent one AirPod from charging even if the contacts are clean, and the case may need replacement.
- If both AirPods charge normally in a different case, your case is the problem; if the same AirPod fails to charge in a different case, the AirPod itself has failed.
How to tell if the problem is the AirPod or the case
Before you replace anything, you need to know whether the left AirPod itself is broken or whether the case is broken. The test is straightforward: borrow a friend's AirPod case or use a different case if you have one, and try charging your left AirPod in it.
If your left AirPod charges normally in the other case, your case is the problem. The charging contacts inside your case are damaged, or the circuit that sends power to that slot has failed. If your left AirPod still will not charge in a different case, the AirPod itself is broken and the battery inside it has failed or disconnected.
This test matters because it tells you what to replace. A replacement AirPod costs less than a replacement case, but only if you know which one is actually broken. Do not assume — test first.
When the charging case itself is the problem
The case has two charging slots, and each one has its own set of metal contacts and its own power circuit. If only the left slot is not charging, the right slot's circuit is still working, which means the case itself is probably fine — just that one slot has failed.
Charging cases can fail in two ways. The contacts inside the left slot can corrode or get damaged, just like the contacts on the AirPod. Clean them the same way: dry cotton swab, gentle rubbing, no liquids. The second way is that the tiny circuit board that controls power to that slot can fail. If cleaning does not fix it, that circuit has likely failed and the case needs to be replaced.
Apple will replace a case under warranty if it is less than a year old and you have proof of purchase. If your case is older or you do not have a receipt, Apple will sell you a replacement case. The cost varies, but expect to pay between $60 and $80 for a standard case.
Battery failure in the AirPod itself
If the left AirPod will not charge in any case, and the contacts are clean, the battery inside the AirPod has failed. AirPod batteries are glued inside the plastic shell and cannot be replaced — the entire AirPod must be replaced.
This usually happens after two to three years of regular use, or sooner if the AirPod has been dropped, sat on, or exposed to water. The battery loses its ability to hold a charge, or the connection between the battery and the charging contacts has broken internally.
You cannot fix this yourself. You will need to replace the AirPod. If your AirPods are still under the one-year warranty, Apple will replace the left AirPod for free. If they are out of warranty, you can buy a single replacement AirPod from Apple, though the cost is nearly as much as buying a new pair.
Water damage and moisture inside the AirPod
If you have worn your AirPods during exercise, in the shower, or in the rain, moisture may have gotten inside the left AirPod. Water does not have to flood the AirPod to cause problems — even a small amount of moisture inside can corrode the battery contacts or the charging contacts and prevent charging.
If you suspect water damage, do not put the AirPod in the case when ready. Instead, leave it in a warm, dry place for 24 to 48 hours. A windowsill in sunlight or a shelf in a warm room works well. Do not use a hair dryer or oven — heat that is too intense can damage the plastic or the battery.
After the AirPod has dried, try charging it again. If it still will not charge, the internal damage is permanent and the AirPod will need to be replaced. AirPods are water-resistant, not waterproof, and they are not meant to be submerged or worn in heavy rain for long periods.
Firmware updates and software glitches
Occasionally, a software glitch in the AirPod or case can prevent charging from working, even though the hardware is fine. This is rare, but it does happen. The left AirPod may appear to charge in the case, but the case does not actually send power to it.
To reset your AirPods, place both of them in the case and close the lid. Wait 15 seconds. Then open the lid, hold the small button on the back of the case for 15 seconds until the light flashes amber and then white. This erases the AirPods' memory and resets them to factory settings. You will need to pair them with your phone again, but this often fixes charging problems that are caused by software.
If the reset does not work, the problem is hardware, not software. Proceed with cleaning the contacts or replacing the AirPod or case.
Checking the charging cable and power source
Before you assume the AirPod or case is broken, make sure the case itself is actually charging. A case that is not charged cannot charge the AirPods inside it.
Plug the case into a different power outlet and use a different charging cable if you have one. Some cables fail or get damaged, and some outlets do not work. If the case charges normally with a different cable and outlet, your cable or outlet was the problem. If the case still does not charge, the case's battery or charging port may have failed.
You can tell if the case is charging by looking at the small light on the front. When you plug it in, the light should turn on. If it stays dark, the case is not receiving power. If the light is on but the AirPods inside still will not charge, the case's battery is dead or the internal charging circuit has failed.
Frequently Asked Questions
Can I use my left AirPod without charging it if the right one works?
No. AirPods are designed to work as a pair, and they will not function if only one is charged. You can use a single AirPod for phone calls or audio if the other is in the case, but both must have battery power to work together. If the left AirPod will not charge, you cannot use it until it is fixed or replaced.
How long does it take to charge one AirPod in the case?
A single AirPod takes about 15 to 20 minutes to charge fully in the case, assuming the case itself is charged. If the case battery is low, charging will be slower. The case itself takes about two hours to charge fully from a power outlet.
What if I cleaned the contacts and reset the AirPods but the left one still won't charge?
Test the left AirPod in a different case. If it charges in the other case, your case is broken. If it still will not charge, the AirPod's battery has failed and needs to be replaced. Contact Apple or visit an Apple Store to arrange a replacement.
Is it cheaper to replace one AirPod or buy a new pair?
A single replacement AirPod costs nearly as much as a new pair on sale. If you need to replace just one, check the current prices at Apple's website or a retailer — sometimes a new pair is only slightly more expensive than a single replacement, especially during sales.
Will AppleCare cover a charging problem?
AppleCare covers manufacturing defects for two years, which includes battery failure and charging problems that are not caused by water damage or physical damage. If you have AppleCare and the left AirPod will not charge, you can get a replacement at no cost. Without AppleCare, you will pay for the replacement unless the AirPods are still within the one-year standard warranty.