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This article applies only to Mac computers with an Intel processor.

About the lithium-ion battery in your Mac notebook

Mac notebook batteries use lithium-ion technology. Lithium-ion batteries charge quickly, are long-lasting, and currently provide the best technology to power your computer.

All rechargeable batteries are consumable components that become less effective as they get older—and their age isn't determined only by time. A battery's lifespan depends on its chemical age, which is affected by factors such as its temperature history and charging pattern. As your notebook's battery ages chemically, its charging capacity gets smaller.

With these tips for maximizing battery performance, you can get the most out of all your Apple devices. And with battery health management, your Mac notebook can take battery optimization even further.

How battery health management helps

The battery health management feature in macOS 10.15.5 is designed to improve your battery's lifespan by reducing the rate at which it chemically ages. The feature does this by monitoring your battery's temperature history and its charging patterns.

Based on the measurements that it collects, battery health management may reduce your battery's maximum charge when in this mode. This happens as needed to ensure that your battery charges to a level that's optimized for your usage—reducing wear on the battery, and slowing its chemical aging. Battery health management also uses the measurements to calculate when your battery needs service.

While battery health management benefits your battery's long-term lifespan, it can also reduce the amount of time your Mac runs on one battery charge when capacity limits are applied. If your priority is making your Mac notebook last as long as possible before recharging, you can turn the feature off.

When battery health management is turned on, your battery's maximum charging capacity might be limited. Although the feature is designed to improve your battery's lifespan, the limited maximum capacity might update your battery status menu to indicate a need for service. Your Mac calculates when to recommend service for your battery based on battery health management being continuously enabled.

How to control the battery health management feature

Battery health management is on by default when you buy a new Mac notebook with macOS 10.15.5 or later, or after you upgrade to macOS 10.15.5 or later on a Mac notebook with Thunderbolt 3 ports.

If you want to turn off battery health management on a Mac notebook with an Intel processor, follow these steps:

1. Choose System Preferences from the Apple menu , then click Battery.
2. Click Battery in the sidebar, then click Battery Health.
   
3. Deselect 'Manage battery longevity'.
   
4. Click Turn Off, then click OK.
   

Note that turning this feature off might reduce your battery's lifespan.

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If you feel that your battery isn't lasting as long as it should, you can learn about getting service for your Mac notebook.

Some Apple products contain sensors that respond when they detect temperature changes inside your system or device, turning on fans to bring cooling airflow to critical components.

About fan noise

If your device's processor is working on intensive tasks—such as compressing HD video, playing a graphics-heavy game, or indexing the hard drive with Spotlight after you migrate data—the fans run faster to provide additional airflow. You might hear fan noise when this happens, especially if you're in a quiet environment. This rushing-air sound is a normal part of the cooling process.

Ambient temperature, the temperature outside the device, also plays a role in the fans' responsiveness. If the ambient temperature is high, the fans turn on sooner and run faster.

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If you hear the fans in your Mac Pro running at full speed and you aren't performing any intensive tasks, check the enclosure. Make sure that your Mac Pro is locked and fully seated, or that the top cover or access door is closed and locked on rack-mounted models.

Make sure the vents on your Apple product aren't blocked

Some Apple products have vents that let fans bring in cool air and expel hot air. Make sure that the vents aren't blocked to allow your device to perform at its best.

• Apple TV 4K has a fan and a vent at the bottom.
• Airport Extreme and Airport Time Capsule have fans and vents at the bottom.
• iMac has vents along the bottom edge and on the back.
• iMac Pro has vents along the bottom edge and on the back.
• Mac mini has vents at the bottom to bring in cool air from beneath the device and vent hot air from the back.
• Mac Pro has three fans on the front of the computer and vents on the front and back.
• MacBook Pro has vents along the side and on the back. MacBook Air computers have vents along the back near the clutch.

The surface your device rests on can block its vents, affecting fan behavior. If you use your device on a soft surface like a couch, pillow, bed, or your lap, its fans might run more. Using your device on a hard, flat surface like a table or desk is best for temperature control.

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If the fans in your Mac run fast even when it isn't experiencing heavy usage and is properly ventilated, you might need to reset the System Management Controller (SMC) on your Mac. If you're experiencing this issue on an Apple TV 4K, Airport Extreme, or Airport Time Capsule, unplug the device, then plug it back in.

Learn more about the operating temperature of Apple notebook computers.