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Is It Bad to Leave your Laptop Plugged in All the Time?

Posted by Arch on June 3, 2019
Is it bad to leave my laptop plugged in all the time

A lot of old-fashioned people will tell you not to leave your laptop plugged in for extended periods of time. Heck, they say the same thing about desktop computers which do not even have a battery. The main reason for this belief is that leaving the laptop plugged in all the time supposedly ruins your battery.

Modern laptops use lithium-ion or lithium-polymer batteries which do not overcharge. Once your battery is full, the power will no longer run through the battery, but it will rather directly charge your laptop, keeping it at 100%. However, is keeping the battery full all the time really beneficial? Is draining the battery completely bad?

This article will cover those and many other questions regarding your laptop battery life and give you useful tips to prolong it.

What Happens When Your Laptop Is Plugged in 24/7

Some old laptop models may have battery overcharge issues if you leave them on all the time, but it is not the case with newer models. However, there is another problem with constant charging. It generates a lot of heat, which can severely damage your battery and shorten its life.

Here is a chart from Battery University, a great place to learn about batteries. It shows the negative impact of high temperatures on lithium batteries.

bad to leave my laptop plugged in all the time

Image source: batteryuniversity.com

Battery life slowly diminishes even at low temperatures, but if you leave your laptop plugged in constantly, you will reduce it even more quickly. You should invest in a good cooler for your laptop and avoid charging it after it is full for too long. The reason for this is not excess power, but the excess temperature. If you keep your battery at 100% all the time, the gauge will not show accurate readings. It can show that you have three hours left when in reality, you might have less than an hour.

How to Fix These Issues

Do not worry; there is a fix for everything. If you notice your battery gauge is not working properly, you can recalibrate it. You need to change your power settings. Some laptops have a built-in battery calibration tool while on other laptops you will have to do it manually. You should do it once or twice a year.

In case you have a simple laptop and you do not use it for difficult tasks, it should be easy to keep it cool even at 100% battery. The battery will actually last longer than in a high-end model. The problem with high-end laptops is they are usually used for graphical rendering, whether in games or professional editing programs which can generate some serious heat. For such builds it might be better to keep the battery at 40% rather than fully charged.

It is hard to guess your laptop’s temperature by just touching it. You can download a free program that will show you the current temperature of your processor. There are many available options. For example, Core Temp is a solid choice.

Additional Tips for a Longer Battery Life

Except for the temperature which plays a vital role in your Laptop’s battery life, voltage is also a huge factor. Your battery’s performance will weaken over time, no matter what you do. However, there are steps you can take to significantly slow the deterioration process down.

Each battery has a set number of charge cycles, depending on the voltage per battery cell. This is not easy to grasp, so here is another chart made by Battery University to make things clearer.

Is it bad to leave laptop plugged in all the time

Image source: batteryuniversity.com

At 100% charge, you get 4.20 V/cell in your battery, which gives you up to 500 discharge cycles. You can extend the battery life by decreasing the voltage a little. Newer laptops usually have programs to assist you with maintaining battery life. They will prevent your battery from staying at 100% constantly. Dell and Lenovo offer these features on their new models.

However, you can manage your battery life yourself by keeping it somewhere in the middle, not fully charged or completely drained. Anything between 30% and 80% is good, as long as the temperature is low as well.

Keep it Cool

Laptops are somewhat like people, they can’t handle too much stress and heat. It is important to have strong fans and take good care of your laptop’s temperature. If you notice it is overheating, you can take out the battery and charge it directly from the power source.

Voltage is also important, so try not to overcharge your battery. Not because of some old myths, but because it can reduce the number of your battery’s discharge cycles.

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