Yeap,igotsanevo4g is correct.To change the battery icon you can study up on the how to theme and that will give you a idea of what you would be doing then open up your fav. rom look inside system for framework file then a apk called framework-res.apk.
This coming from someone that has done it and ksmith has too.Battery has over 100pngs so you can go completely nuts and make it to look how you want.
Sprintgirl did do a great job,all it takes is a little reading and some set up and you could be making custom anything in no time.Give the sticky a read.