Yeai bought a DS yesterday and it turned on out of the box which i thought was a bit weird. Anyways it was supposed to be brand new, does the ds just come charged? It was the white version *pointless info maybe but who knows lol*
All of the DSLites that I've bought have come with about 20 mins of usable charge. I think it's part of the final testing before packing them up at the factory (but I may well be wrong). I'd say it was normal and not to worry.