Is it OK to leave laptop charger plugged in?

The correct answer is yes. It is perfectly ok to leave your laptop plugged in even with a full charge. However, power surges can be dangerous for your laptop battery. It is recommended you keep your laptop battery plugged into a surge suppressor. However, it is only natural for your battery power to diminish overtime. In this occurrence, Universal Laptop Chargers can be a quick and cheap alternative and a failsafe backup option.