What's the best thing to do with a 3DS when you're not using it? There seem to be varying answers on this subject. Is it safe to leave it plugged into an official Nintendo charger all the time, assuming the outlet is reliable? Is it better to leave it turned off and only turn it on when necessary, even if that means frequently turning it on and off? Or is it better to leave it in sleep mode and then plug it in once the battery wears down?