I've been using Battery Time Remaining for a while and it has some useful features that even the old indicator didn't have (for instance, which apps are draining the battery the most).
https://itunes.apple.com/au/app/battery-time-remaining/id551...
https://itunes.apple.com/au/app/battery-time-remaining/id551...
It does feel painful to give Apple 30% of $0.99 (US) in this instance.
PS. i especially like the notifications you can set at 100%, 15%, 5% etc battery life. very handy!