MacBook Air (M3) with 100% health and low count shuts down before low battery alert

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MacBook Air (M3) with 100% health and low count shuts down before low battery alert

Hi guys, I have a reoccurring problem with my 15" Macbook Air (M3, 2024) - running Tahoe 26. It is fairly new, has 68 cycle count, 100% max capacity and the battery health normal. When using it until to the lower end of the battery the laptop unexpectedly shuts down before reaching the low battery alert. Sometimes is around 15% sometimes is less. It starts back again after plugging it in, sometimes seeing differences in battery left - for example it shuts down at 10%, opens up with 4-5% or charges 2-3% in a matter of seconds, etc.

After doing a "calibration" by charging it to 100%, keeping it plugged some time (1-2hrs) then using it to 0 and charging it again to 100%, i noticed that the problem dissapeared, as in the next time after using it, it reached 6%, displayed properly that the laptop has low battery, and didnt shut down, after which i plugged it in (so did not test if it goes to 1-2% or not). I also ran an apple diagnostic (cmd+D at start up) which returned that the battery is fine. But now the problem persists.

Now my question is should i take it to have it diagnosed ? I only have authorized apple partners in my area (not apple stores or genius bars) and i am not sure if they would actually try and fix it or just send it back saying it doesnt have a problem. I also have 10 days left of warranty left.

MacBook Air 15″

Posted on Mar 14, 2026 3:47 AM

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HWTech

Community+ 2026

Level 9

73,342 points

Mar 14, 2026 9:16 PM in response to viper817

It is hard to say for certain, but it sounds like the battery may have a hardware fault (classic symptom). Unfortunately both macOS & the Apple Diagnostics (even the service diagnostics) are usually unable to detect such battery hardware issues.

You should have Apple or an Apple Authorized Service Provider examine the laptop to provide you with a repair estimate for replacing the battery. You may have trouble convincing them to replace the battery because they tend to only authorize battery replacements if the diagnostic fails or the battery condition shows "Service Recommended", but since the Apple Silicon Macs can be replaced on their own separate from the Top Case Assembly.....they may be more willing to replace the battery.

Until the battery is replaced, you should avoid letting the battery drain below 20% charge. Another option that may help is to configure "Low Power Mode" to "Only on Battery" in the Battery System Settings, but this will impact performance of the system. Because it does impact the performance of the system, it may even allow macOS time to warn you of a low battery condition & perhaps even have time for hibernation until you can connect the power adapter.

"Calibrating" the battery won't do anything. The only time that is needed is when installing a third party battery. A third party battery tends to need some exercising on first use before being used normally. An Apple OEM battery doesn't need "calibrated" or exercised in that manner.

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