Should I keep my laptop powered on all the time?
You cannot overcharge the laptop's battery
Related: Debunking mobile phone, tablet and laptop battery life myth
It is important to understand the basics of how standard lithium-ion (Li-ion) and lithium-polymer (LiPo) batteries work in modern equipment. There are a lot of myths about batteries.
These batteries cannot be "overcharged". When you reach 100% charge and keep your notebook powered on, the charger will stop charging the battery. The laptop will run directly through the power cord. After the battery is briefly discharged, the charger will start up again and stop the battery. By charging the battery, it will not damage the battery.
As time goes by, all batteries wear out (for some reason)
As time goes by, your laptop battery will always run out. The more charge cycles a battery passes through, the more it loses. Different batteries have different ratings, but you can usually expect about 500 full charge cycles.
This does not mean that you should avoid discharging the battery. High-power storage batteries are not good for this. On the other hand, it is not good to let the battery run out of power every time it is used. It is not possible to tell the laptop to charge the battery with about 50% of the battery, which may be the ideal choice. Most importantly, high temperatures can also cause the battery to wear out more quickly.
In other words, if you plan to put your laptop battery somewhere in the closet, it's best to keep it at about 50% of the charge and make sure the closet is quite cool. This will extend battery life.
If you can, please remove the battery to avoid fever
This is one thing: the heat is not good. Therefore, if your laptop has a removable battery, you may need to remove the battery from your laptop if you plan to insert it into your notebook for an extended period of time. This ensures that the battery is not exposed to all unnecessary heat.
This is especially important when the laptop is running very hot, such as a powerful gaming laptop running demanding PC games. If your laptop is running cool, you won't get much benefit from it.
Of course, many modern laptops no longer have a detachable battery, so in these cases, this technique will not work.
But should I not plug in?
In the end, it is not clear which battery is worse. Keeping the battery at 100% capacity reduces its useful life, but running it through repeated discharge and charge cycles also reduces its useful life. Basically, no matter what you do, the battery wears out and loses capacity. This is how the battery works. The real problem is what makes it die more slowly.
Laptop manufacturers are everywhere. Apple has suggested not to plug the MacBooks all the time, but they are no longer included on their battery recommendations page. Some PC makers say it's okay to always plug a laptop into a power source, while other PC makers suggest there is no obvious reason to object.
Apple once recommended charging and discharging the laptop battery at least once a month, but it is no longer doing so. If you are concerned that your laptop is always plugged in (even if it is a PC laptop), you may need to charge it once a month for security reasons. Apple once suggested doing this to "keep the flow of battery juice." However, whether this will help depends on the device and its battery technology, so there is actually no omnipotent answer.
Occasional discharge and charging can help "calibrate" the battery
Occasionally charging your laptop fully can help calibrate the batteries on many laptops. This ensures that the laptop knows exactly how much power is left and can show you accurate estimates. In other words, if your battery is not properly calibrated, Windows may think that there is actually only 20% of the battery left at 0% and the laptop will shut down without warning too much.
By having the laptop's battery (almost) fully discharged and then recharged, the battery circuit can understand the remaining charge. Not on all devices. In fact, Apple made it clear that there is no longer a need for a modern MacBook with a built-in battery.
This calibration process does not increase battery life or maintain more energy, only to ensure that the computer gives you accurate estimates. But this is one of the reasons you don't want to plug in your laptop all the time. When you unplug the power cord and use it for battery power, it may show you an incorrect battery life estimate and die before your expected life.
The laptop's battery won't run out forever, no matter what you do, its capacity will gradually decrease over time. All you have to do is hope that the laptop's battery will run out until you can replace it with a new one.
Of course, even if the laptop's battery capacity drops, you can continue to use it anyway, just plug it in.
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