Why Not Keep MacBook Charged to 100 Percent?

Bethany Walsh

Aug 08, 2022

How Do MacBook Batteries Work?

Powering MacBooks are lithium-ion batteries, which are both lightweight and powerful. However, their charging capacity declines with age, like any other battery. Depending on how old your battery is, you could see a decrease in usable time of several minutes to several hours.

You may have noticed that batteries charge rapidly from empty to 80 percent but take noticeably longer to reach full capacity. Lithium-ion batteries have this trait because their energy storage mechanism becomes fragile above about 80% capacity. Due to the ease with which batteries can overheat and be damaged, current battery technology limits charging to between 80 and 100 percent. There's a sweet spot, somewhere between 40% and 80%, where lithium batteries maintain their maximum lifespan. Neither fully charging nor letting the battery get close to empty is good for the battery's life.

What Is The Maximum Life Span Of The MacBook's Battery?

Select Apple from the main menu. When Option is held down, the Option to view system details appears. Choose Power from the list of options under Hardware on the sidebar to the left. Battery Information >'' Health Information is where you can find the cycle count. The condition of your battery will be displayed as well. It might or might not indicate Normal.

Best Practices

If you own a MacBook, you might find it helpful to have a quick reference to the most efficient ways to handle your battery life. Always remember to unplug your laptop at the end of the day and let it power down to between 30 and 40 percent.

Keep your battery from frequently discharging to zero by avoiding doing so. Battery University, which does not award degrees, puts it this way: "You should try to keep the battery from completely discharging and charge it as often as possible in between uses. The battery does not retain any charge and does not require regular full discharge cycles to maintain its life."

Contemporary Apple laptops For the most up-to-date Apple notebooks, the 10.5.5 version of macOS Catalina introduces a new preference pane under Energy Saver called Battery Health, where you can ensure that Battery Health Management is turned on. New Mac notebooks have more up-to-date features preinstalled when upgraded to macOS 11.11, Big Sir.

Leave Optimized Charging On

Optimized Charging is useful for Apple's iOS devices and Macs, as it learns from your charging habits and behavior over time. To maximize the lithium battery's life, the percentage should be between 40 and 80. Battery cells are damaged when charged to their maximum capacity or discharged to dangerously low levels. Because of their greater capacity, fully charged batteries may be more susceptible to damage. According to the experts at Battery University, "a device should feature a 'Long Life' mode that keeps the battery at 4.05V/cell and offers a [state of charge] of about 80 percent" to do just that and lengthen their usefulness. Apple is only one of many companies to adopt such pricing strategies.

Avoid Exposing Your MacBook to Extreme Temperatures

Researchers found that the lithium battery's cathode could become dislodged from the rest of the battery if exposed to extremely low temperatures. "led batteries to lose up to 5% more of their capacity after 100 charges than batteries stored at warmer temperatures," the article states of cathodes kept at temperatures below freezing. The solution is to avoid exposing your notebook to extremely high or low temperatures. Please don't leave it in your car all winter. Also, invest in a hard shell case if you think your MacBook might get too cold. Apple's MacBooks aren't the most durable laptops and weren't made to withstand high heat.

Can I keep my Mac always on?

As a result, To answer your question directly: yes. That's fine. But, you might be able to notice a little slowing down as time passes. The advice to restart your Mac every so often is widely regarded as sound advice. Memory leaks are a common cause of the slowdown in time-consuming, resource-intensive programs, particularly badly written ones. Single-bit RAM errors can occur even when your Mac isn't being rebooted. Most of these one-bit problems originate from cosmic sources emitting ionizing radiation. Over time, they deteriorate even further.


The battery life of any MacBook, MacBook Pro, or MacBook Air decreases over time if the device isn't constantly connected to a power source, such as the internet. The battery's maximum capacity decreases over time, meaning you'll have less time — or even minutes or hours — to use it. This is a common characteristic of the lithium-ion batteries used in notebooks and other modern electronic devices. The Battery University suggests charging your MacBook at a rate between 25% and 15% for maximum efficiency. Instead of charging it to full and then letting it drain to half, this method is more efficient. Avoid using the battery to zero, as this can cause permanent damage.

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