Ashwin Lewis
It can be frustrating to find your MacBook's battery drained after leaving it idle or asleep. This issue can be caused by several factors, including energy-intensive apps running in the background, the Power Nap feature, connected peripherals, and network activity. To prevent battery drain, you can try turning off certain features like Screen Time and Bluetooth, unplugging USB devices, updating your apps and operating system, and managing your notifications. Additionally, you can use the Activity Monitor to identify and close processes that consume significant power.
Characteristics and Values
| Characteristics | Values |
|---|---|
| Energy-intensive apps running in the background | Apps that sync data online, perform updates, or execute background processes |
| Power Nap feature | Enabled by default, this feature allows your MacBook to update emails, notifications, and calendar events while in sleep mode |
| Connected peripherals | Devices connected to your MacBook, such as external hard drives, mice, and keyboards, can draw power from the battery even when not in use |
| Network activity | If set to wake for network access, the MacBook can come out of sleep mode to check for network requests, leading to additional battery drain |
| Bluetooth and Wi-Fi connections | Keeping Bluetooth and Wi-Fi on can cause battery drain as the MacBook constantly searches for nearby devices and connections |
| Screen Time settings | Screen Time, a feature that tracks screen usage, can cause battery drain even when the MacBook is in sleep mode |
| Login items and background processes | Applications that automatically open during login or run in the background can consume CPU resources and Mac energy |
| Outdated apps and operating system | Outdated software can contain bugs that cause excessive battery drain; updating them can improve energy efficiency |
| Notifications | Notifications that pop up on the screen, even when the MacBook is asleep, can contribute to battery drain |
| SMC (System Management Controller) settings | Resetting the SMC can resolve issues with the MacBook not entering sleep mode and improve battery performance |
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What You'll Learn
Energy-intensive apps running in the background
One of the main reasons your MacBook's battery drains while it's in sleep mode is because of energy-intensive apps running in the background. Some applications continue to run in the background, even when your MacBook is in sleep mode. These include apps that sync data online, perform updates, or execute other background processes.
For example, a user on Super User found that the TuneIn app was causing coreaudiod to prevent their MacBook from sleeping. Another user on the same platform discovered that the Spotlight app was draining their battery.
To identify which apps are causing the problem, you can use the built-in Activity Monitor app on your Mac. Open Activity Monitor by searching for it using Spotlight (Cmd + Space). Then, click the '% CPU' column in Activity Monitor to sort the apps and processes by power usage, from the most to the least. If you notice any processes using more than 60% of your CPU, it's best to close them.
You can also check the 'Idle Wake Ups' column in Activity Monitor to identify other processes that might be waking your MacBook while it's not in use.
To prevent apps from running in the background and draining your battery, you can disable login items. Login items are applications that open automatically when you log in, and they can consume a lot of CPU resources and Mac energy.
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Power Nap feature
One of the main reasons why your Mac uses battery power while sleeping is due to a feature called Power Nap. Power Nap is a feature designed to keep your Mac up-to-date and ready to use even while it's asleep. Here's how it works and how you can manage it to conserve battery life:
Power Nap is a background feature that allows your Mac to periodically wake up from sleep mode to perform several tasks. These tasks include
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Connected peripherals
If you want to prevent your Mac from using up battery power while it sleeps, it's important to pay attention to connected peripherals. These are devices connected to your MacBook, such as external hard drives, mice, and keyboards, which can draw power from your MacBook's battery even when not in use.
USB accessories, for example, can use your MacBook's battery when connected, especially if they don't have their own power sources. In such cases, they draw power directly from your MacBook, draining its battery. To prevent this, unplug USB devices when you're not using your MacBook for extended periods.
Similarly, Bluetooth-connected devices can also drain your MacBook's battery while it sleeps. Keeping Bluetooth devices connected means your MacBook is constantly searching for and staying connected to nearby Bluetooth devices, which uses power. To conserve battery life, disconnect Bluetooth devices before putting your MacBook to sleep.
Additionally, certain applications that sync data, perform updates, or execute background processes may continue to run in the background, using battery power. To identify and manage these applications, you can use the built-in Activity Monitor app on your Mac.
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Network activity
If your MacBook is set to wake for network access, it can come out of sleep mode to check for network requests, leading to additional battery drain. This is because your MacBook is constantly searching for nearby Bluetooth devices, which can be a slow drain on your battery.
To prevent this, you can turn off Bluetooth before putting your MacBook to sleep. You can also disable Bluetooth connections when the lid is closed.
Another way to reduce battery drain is to turn off Screen Time in System Settings. This has been known to improve battery life dramatically, although it is a useless feature for 90% of users.
You can also check which applications are draining your battery by using the built-in Activity Monitor app on your Mac. Click the '% CPU' column in Activity Monitor to sort apps and processes by power usage. If you notice any processes using more than 60% of your CPU, it is best to close them.
Finally, you can try resetting your Mac's SMC, which manages various hardware processes, including the battery.
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Bluetooth and Wi-Fi
If your Mac is using battery power while sleeping, it could be due to several factors, including Bluetooth and Wi-Fi connectivity.
Bluetooth:
Leaving Bluetooth on can cause your Mac to use battery power while sleeping. When Bluetooth is active, your Mac constantly searches for and attempts to connect to nearby Bluetooth devices. This process consumes a significant amount of power, especially if multiple devices are connected. To conserve battery life, it is advisable to turn off Bluetooth when not in use. Additionally, disabling Bluetooth devices near your Mac can prevent accidental pairing attempts, further reducing power consumption.
Wi-Fi:
Keeping Wi-Fi enabled can also contribute to battery drain during sleep mode. When Wi-Fi is left on, your Mac may periodically wake up to check for network requests or perform system tasks, resulting in increased power consumption. Disabling Wi-Fi before putting your Mac to sleep can help prevent this issue.
To summarise, turning off both Bluetooth and Wi-Fi can significantly reduce battery usage while your Mac is sleeping. This is because both functionalities require constant background processes that consume power, even when the device is not actively in use.
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Frequently asked questions
There are several reasons why your Mac may be using battery power while sleeping. These include:
- Energy-intensive apps running in the background.
- The Power Nap feature.
- Connected peripherals, such as Bluetooth devices and USB accessories.
- Outdated apps and operating systems.
You can use the built-in Activity Monitor app on your Mac to check for apps and processes using a lot of power.
Power Nap is a feature on Intel MacBooks that allows background processes, like checking Mail messages and making Time Machine backups, to run when it's running on battery power—even while it's in sleep mode.
To prevent your Mac from using battery power when sleeping, you can try the following:
- Turning off Screen Time in System Settings.
- Turning off the Power Nap feature.
- Disconnecting peripherals, such as Bluetooth devices and USB accessories.
- Updating your apps and operating system.
