It's not available on the iPod touch without a jailbreak for some stupid arbitrary reason.
Apparently when I jailbroke my 4th gen iPod a long while back and added battery percentage, it never went away with updates, nor iOS 6, nor restore from backup to my 5th gen.
No option for that on iPod touches.
WRONG. A simple google search would have your answer.
Guy above posted same link...
Sent from my iPod touch using Tapatalk 2