Permanently charging your laptop can shorten its lifespan. This is due to the stress placed on the laptop’s lithium-ion battery when it’s kept at 100% charge. Over time, this can degrade the battery, reducing its performance. The optimal state for your battery is between 20% and 80%. To prolong your battery’s performance, it’s recommended to fully charge your laptop and then let it run down throughout the day. High-speed charging cables can also damage your battery by transferring lithium ions too quickly. This myth of always keeping your laptop plugged in is slowly killing your laptop.
Read more at: gizmodo.com