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Is it Bad to Leave your Laptop Plugged In?

The age-old question: should you leave your laptop plugged in all the time or unplug it once it’s fully charged? This debate has persisted for years, and the answer often involves the intersection of battery chemistry, technology, and user habits. Let’s break down the key points.

Understanding Modern Laptop Batteries

Most modern laptops use lithium-ion or lithium-polymer batteries. These batteries have several advantages:

The Life Cycle of a Battery

Every battery has a limited number of charge cycles, often counted as the number of full 0% to 100% charges. For example, if you use your laptop down to 50% one day and then charge it fully, and do the same the next day, that’s counted as one full charge cycle.

As batteries go through more cycles, their capacity to hold charge diminishes. Therefore, constantly draining and charging your battery can, over time, reduce its overall lifespan.

Heat: The Silent Killer

One of the biggest threats to laptop battery longevity isn’t necessarily the charging habit but heat. Laptops that are continually plugged in might produce more heat, especially if they are being used for demanding tasks. Lithium-ion batteries degrade more quickly when exposed to higher temperatures. So, if your laptop tends to get hot while plugged in, it’s not the act of charging that's the problem, but the heat itself.

Striking a Balance

Some experts suggest maintaining your battery level between 20% and 80% for optimal longevity. A few laptop manufacturers offer software solutions that limit the charge to 80% to prolong battery lifespan. If you’re someone who rarely uses the laptop off the charger, this can be a good compromise.

Practicality Matters

While it’s useful to understand optimal charging practices, it’s equally important to consider practicality. If you are a student or professional who needs the laptop to be fully charged to last through classes or meetings, then charge it fully. A tool’s primary role is to serve its user, after all.


Leaving your laptop plugged in won’t necessarily ruin your battery, especially with modern battery management systems in place. Still, to get the most out of your battery in terms of lifespan:

Ultimately, the best practice is to find a balance between preserving battery health and ensuring your laptop is ready for your day-to-day needs.

About this post

Posted: 2023-08-25
By: dwirch
Viewed: 271 times






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