The light at the bottom that signifies the cord is plugged in is green. Turns out that when the battery is recognized as fully charged (80%), the charger supplies power consistently. But when I put the battery on with the cord, the charger behaved perfectly, so I thought it was just a hiccup. I've had a charger before that broke and did not charge the laptop at all (I think the upper cord got completely frayed) so I was afraid the same thing happened. I did not accidentally pull out the cord or anything. I was doing this for about a week, but one day, when I was watching a movie, my laptop literally turned off. I use my laptop with only the charger plugged in as often as possible and only use the battery when I need to. I use Samsung's battery life extender program which only charges my battery up to 80%. But I think the charger is slightly malfunctioned. I recently bought a new battery pack and charger for my laptop. Right now, a very peculiar thing is happening. I have horrible luck with laptop batteries and have met multiple episodes of frustration with them.