Is Leaving Your MacBook Plugged In All Day Actually Bad For The Battery?

Subscribe to our Telegram channel for the latest stories and updates.

Most laptops today are basically semi-portable desktops. Plugged in at work, plugged in at home, unplugged briefly when someone wants to feel productive in a café.

Laptop manufacturers have gradually adjusted to that behaviour over the years, including Apple, which changed how newer MacBooks handle charging and battery management in the background.

Once sufficiently charged, newer MacBooks can run directly from the power adapter instead of constantly cycling through the battery. Apple also uses software features like Optimised Battery Charging to reduce how long the battery stays at full charge.

That is why leaving a MacBook plugged in while working at a desk is now considered normal usage.

But hey, battery ageing still applies.

Lithium-ion batteries degrade faster when held at high voltage for extended periods. Apple says features like Optimised Battery Charging and Charge Limit are designed to reduce battery ageing over time.

Power passthrough reduces unnecessary charging cycles by letting the laptop draw power directly from the charger. Charge management reduces chemical stress by limiting how long the battery stays near 100 percent.

That is also why Apple added manual charge limits to supported Apple silicon MacBooks running newer versions of macOS. Users can now cap charging between 80 and 100 percent through Battery settings.

The feature exists for people who keep their laptops plugged in most of the time.

Windows laptop manufacturers have been adding similar systems for years. MSI, ASUS and Lenovo all offer battery preservation modes that limit charging levels during long-term AC use.

It’s worth mentioning that heat (this horrible, tropical heat) still affects battery lifespan heavily.

Apple’s battery documentation notes that high temperatures can permanently reduce battery capacity, and macOS may pause charging above 80 percent if temperatures exceed recommended ranges.

That means a MacBook sitting at 100 percent charge under sustained heat will generally see faster degradation than one running cooler with a lower charge limit.

If you regularly use your MacBook unplugged, Apple’s default Optimised Battery Charging system is usually enough. If the laptop spends nearly all its time connected to a charger at a desk, enabling an 80 percent charge limit will generally reduce long-term battery wear.

Users can manage these settings under: System Settings → Battery → Charging

Battery health information is available under: System Settings → Battery → Battery Health

Laptop batteries are still consumable hardware. The difference is that modern charging systems now do a much better job reducing unnecessary wear before users even think about it.