So, having a battery fully charged and the laptop plugged in is not harmful because as soon as the charge level reaches 100%, the battery stops receiving charging energy and this energy is bypassed directly to the power supply system of the laptop. Hope it helps.
I brought a new laptop dell Inspiron 15 5502, Is this laptop has auto-power cut off functionality when battery is set to 100%. And should I always plugin my charger whenever I uses my laptop will it affect laptop's battery life. Or should I charge it to 80% to 90% & then discharge my battery.   Which option is best for battery life & laptop performance?
AUTO POWER CUTT OFF WHEN BATTERY CHARGES TO 100%