I recently got an onyx black Nintendo DS Lite, and I decided to test out its battery life. On my Acekard 2i, I played Professor Layton and the Curious Village for 8 hours and 10 minutes, and I played Pokemon Diamond for 1 hour and 15 minutes, both on the lowest brightness, and the light changed from green to red. Nintendo says that the light changes from green to red at around 30%. This means that the ds would have lasted for around 14 hours before dying. Nintendo says that the battery lasts 15 to 19 hours. Why do I have a reduced battery life? Could it be because i'm using a flash cart? Has anyone else experienced this reduced battery life problem?