[ame=http://www.youtube.com/watch?v=2lPoXWiqGT8]YouTube - ‪Remove Battery Bar / Only Show Percentage With Bolt - iOS Vlog 415‬‏[/ame]
With the Cydia tweak "Bolt" you can remove that battery image on your status bar to add a little more room. This tweak leave only your percentage since thats really all you need. I can't remember a single time when I, personally, estimated my battery with just the indicator image. Ever since it was available the percentage indicator was the best way to know when you're almost out of juice. This tweak also adds a lighting bolt when you're are charging, if the sound wasn't enough. You can find Bolt for Free in the Cydia Store.