While I don't agree with parent's declaration of all MacBooks being toys, that battery drain issue while being plugged in definitely did happen. Couldn't find a

While I don't agree with parent's declaration of all MacBooks being toys, that battery drain issue while being plugged in definitely did happen. Couldn't find a source for it just now, though. It used to happen on my 15" 2013 MacBook Pro when it was plugged in and I was playing games (BioShock Infinite was one such game).