playing 3ds on charge bad?

[UndyingUmbreon]

You should be fine, lithium ion batteries like the one in the 3DS are made so they won't over charge or hurt the system. You could practically do all of the worst things to the battery and it would still last longer than the ds itself. That being said, playing while charging is very, very low on the list of bad things you could do to a battery
But it looks like Naitre beat me to it kappa