First off, I absolutely stay away from WinterBoard, so that's not an option... When on 3.1.2 with my 3GS, I was able to customize the battery images on the lock screen when charging. I used the png's from the "Battery Colors" package in Cydia. Basically, it's a fade from red when empty, to various greens when charging all the way to blue when fully charged. I tried reinstalling these PNG files through iPhone explorer and they wouldn't take(?). The files are all named appropriately and I overwrote the factory ones just like I did in 3.1.2. Anyone else have the same/similar issues?