I notice my DS's batteries die in about 4 hours with sound off. I THINK the brightness adjusting isn't working with acekard 2. I mean, I set my brightness to the lowest, but when I start up acekard, I notice a slight increase in brightness. Maybe it's just my imagination? My DS Lite is brand new so the battery can't be that old. I know it's possible to buy a new battery, but I want to see if it's actually some brightness glitch that's causing the issues first. I have the newest firmware... I think. It's hard to figure out what's what. I just download the one that's labeled the newest.