"The short answer is that it typically is not a big deal to keep your laptop plugged in while in use for convenience. However, there are some signs you should look out for that warn you that the laptop battery is suffering. Things like your computer feeling too hot and the fan making excessive noise are red flags. You should also unplug your laptop when not in use for the overall longevity of your battery, and when there are storms outside to avoid power surges."
"The reason why keeping your laptop plugged in is not necessarily dangerous is because of the design of modern laptop batteries. They use trickle charging to keep the battery at full charge without overloading it with too much power. The black box on the charging cable also helps with power control. Newer laptops tend to handle being consistently plugged in better than older ones simply because of the wear and tear on the batteries with age."
Laptops with modern lithium-ion batteries and charging circuits can remain plugged in during use because trickle charging and power-control hardware prevent overcharging. Newer laptops tolerate constant connection better than older models, though battery wear still accumulates over time. High-power tasks like gaming or video editing increase thermal and power stress and can accelerate battery degradation. Signs of battery or power strain include excessive heat and loud fan noise. Unplugging when not in use helps prolong battery longevity. Unplug during electrical storms to reduce the risk of damage from power surges.
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