Download the zip file, read the instructions.txt file, follow the instructions and be happy.
Included are 18 different battery styles. Some can be found here.
When the new Android build gets released, I'll update the tool.
If you can't flash it using the MOD Tools own flash zip, then take the SystemUI.apk from the Output Files/Modded Apk folder and drop it in the attached Battery MOD Flasher zip in the system/app folder. Flash it in the recovery.
EDIT: Added the Battery.percentage.modifier. Once you have modded the SystemUI with the mod tool and you want easily to change the battery icons, just drop the 204 png's in the BM.Battery.percentage.modifier.zip\vrtheme\system\ app\SystemUI.apk\res\drawable-xhdpi folder and flash the zip in the recovery.
Download Battery MOD Tool for Android 4.3