Open your ROM with 7zip. Go to system...apps...systemui.apk...res folder...drawable-hdpi...find the png that are stat_sys_battery and stat_sys_battery_charge. Change those to your liking. Then go to system...framework...framework-res.apk...res...drawable-hdpi...find those same files and change them.
Make sure to back out of 7zip using the back folder icon, so the apks change. Then you could use my eclipse zip folder and delete the systemui.apk and framework-res.apk and just add your roms in there. Download it to your phone and flash it. Wrote this quick, hope it makes sense.
Is there a way to do it all on the phone? Would AndroZIP our a similar app allow me to open the apk files and edit them?
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