If you’ve updated to iOS 5 since October (and there’s an 80% chance that you have) you’ll most likely have experienced the less than perfect battery performance. Almost everyone I’ve spoken to has noticed a slight dip in efficiency, some had an odd bug whereby the fuel would drain in only a few hours. Whatever you’ve experienced, it’s taken for granted now that Apple no longer considers it a problem. Unfortunately, that’s just how it is.
There’s every chance that the issue is down to some buggy apps, and that’s where Carat comes in. You can use the app (found in the App Store) to close any apps that are using more power than necessary. It show up the ones that are causing the problem and close them down.
“Carat wasn’t built to make money. It’s the consumer product of cutting-edge battery science and a way for the team to collect more anonymous, privacy-respectful data for research that could make all our devices last longer.”
The application is free, and is certainly worth trying out. I’m downloading it as I write this.