I just got my DS Lite a few weeks ago, and I had a possibly dumb question about the battery. On the main screen, there is a battery indicator in the upper right hand corner. Does this ever 'decrease' (like on an iPod, for example), or does it just go from full green to red? There have been times when I would have really liked to have known how much battery power I had left, however, I have only ever seen the full green battery indicator, and the flashing red light while I have been playing a game. Is there any way to tell how much power I have left besides speculating based on the screen brightness I've set it on? Thanks.