Leaving a laptop plugged in and charging all the time can have a negative effect on the battery’s overall health and lifespan.
Most laptop batteries are lithium-ion batteries, which have a limited number of charge cycles. A charge cycle is defined as a full discharge and recharge of the battery. Each time you recharge your battery, you use up one of its charge cycles. Over time, as the battery goes through more charge cycles, its capacity will decrease and it will eventually need to be replaced.
When you keep your laptop plugged in and charging all the time, you reduce the number of charge cycles that the battery goes through, which can extend its lifespan. However, charging a lithium-ion battery to 100% and keeping it at that charge level for an extended period of time can also have a negative effect on the battery. This is because lithium-ion batteries are designed to operate within a specific charge range, and keeping them at 100% for too long can cause damage to the battery’s chemistry.
To maximize the health and lifespan of your laptop battery, it’s best to keep it charged between 20% and 80% when possible, and to avoid keeping it plugged in and charging all the time. If you need to use your laptop while it’s plugged in, it’s best to remove the battery and run the laptop on AC power. This will help to reduce the strain on the battery and extend its lifespan.