Should You Leave Your Laptop Plugged in All the Time?

Posted by bmedia on Thursday, October 15, 2015

Stonebridge Mortgage Group_Should You Leave Your Laptop Plugged in All the Time
Many people know things they can do to improve their laptop’s battery life but have you ever wondered if you could extend the battery’s actual lifespan? Have you heard of people leaving their laptop plugged in at all times instead of using the battery power? Understanding more about how battery’s work can help you get the most out of your laptop’s battery.

For both types of batteries, the following statements are true (for modern laptops):

  • A battery cannot be overcharged. There’s no danger of a battery being overcharged if you leave it plugged in all the time. As soon as it hits 100%, it will cease charging and won’t start again until the voltage falls below a certain level.
  • Fully discharging a battery will damage it. Having a battery fully discharged for an extended period can put it into a deep discharge state, from which it might never recover.

So, based on this, do we conclude that you should simply leave your laptop plugged in all the time? Not quite.

Things That Damage Lithium Batteries

The truth about lithium-based batteries is that they are inherently unstable. They begin to lose capacity from the moment they are produced, and there are numerous factors that hasten their decline. These include:

  • Charge/discharge cycles. Every battery has a finite number of times it can be charged and discharged.
  • Voltage level. The higher the charge level (measured in volts per cell), the shorter the battery’s life.
  • High temperature, over 30 degrees celsius. This can cause irreparable damage.

The last two are the ones that we’re most concerned with here. A comprehensive study by Battery University highlights how voltage level and high temperatures will shorten the life of a battery in isolation, and even more when they combine.

SRC: Learn more about how batteries work at:


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