Your MacBook has a few features built in to ensure that its battery's health stays intact. It will automatically shut down the laptop if it gets too hot, since higher temperatures reduce the battery's life and capacity to perform. It'll also slow down charging when the battery is at 80% if it determines you won't need a full charge. While these features are good enough for most people, there are some battery management apps that will allow you far greater control over your MacBook's battery health.
Battery Toolkit is the best free app I've found to manage your MacBook's battery. It allows you to keep your MacBook's battery percentage between two predefined values, lets you stop charging your MacBook even when it's connected to power, and even lets you force your MacBook to charge to 100%. Some of these features require you to pay on other battery management apps, such as AlDente.
Battery management apps are best used by people who like to keep their MacBook plugged in all the time. Plenty of people use their MacBooks with the lid shut, where the laptop is connected to a monitor, an external keyboard, and a mouse. In these situations, plugging in and unplugging the Mac repeatedly to prevent overcharging is a little cumbersome. Why put in all that effort when an app can manage your battery for you?
To start, download Battery Toolkit from its GitHub page. Your Mac may prevent you from installing the app because it's not from a well-known developer, but it is safe to use. Go to System Settings > Privacy & Security and click Open Anyway to install it.
Once the app is running, set it up in a way that works for you. Click Battery Toolkit's icon in the menu bar up top and select Settings. Go to the Power tab and set a minimum and maximum percentage value. That way, your MacBook will start charging when it hits the minimum value and stop charging at the maximum. I've set it up to keep my MacBook between 30 and 80%, but you can choose the values that work best for your use. Click OK when you're done.
Note that the app doesn't allow you to let the minimum percentage drop below 20%, and the lower limit for the maximum charge is 50%. This is to prevent damage to the battery.
With the initial setup done, Battery Toolkit will run in the background and do what you've asked. You can keep the MacBook plugged in all the time and the app will ensure that its battery stays within the predefined threshold. But there are times when you need to change things around, and the app lets you do that too. Click Battery Toolkit's menu bar icon to see these features.
You can toggle on Disable Power Adapter to temporarily stop the MacBook from charging while it's plugged in. There are two more options here that you should know about:
Request Charging to Full
Request Charging to Maximum
These options can be confusing because of the way they're worded, but it's quite easy to understand. Charging to full will force your MacBook to charge to 100%, which you should use when you know you're going to be away from a power adapter for a long time. Charging to maximum will charge the laptop to the upper limit you've specified in the app.
You can also temporarily disable all of Battery Toolkit's settings by clicking its menu bar icon and selecting Quit Battery Toolkit.
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