Im confused on what you are asking for???
The battery and percentage numbers are all in that folder and are images not icons.
Im guessing you want to replace the plan white images of the battery and percentage with others images. Is that correct?
I used the "Percentage Battery" Theme from Cydia and changed the colors of the images. The images i changed where:
i have tried to do this but i have tried to replace the default icons to circles, (smaller the circle, smaller the battery life). However it does not work. When i try to change the image it either doesnt work or the default rectangle is displayed over the top of the circles.