How long should the iPhone 4S battery last?

I have my brightness in the middle most of the time and mine only lasts about 3-4 hours if I'm using it. Standby, it's life is about 4-5 hours

If it;'s the original battery, your 4S is doing well. Congrats.

It might be you have to many applications open. Try double clicking the start button - the apps should show up like "cards". Flick Up ones you don't really need running All the time to make them actually stop running. When you "close" an app on the iPhone is usually just makes it no visible, but it's still running. This also will free up a bit of working memory and your phone will run faster.

If this doesn't work take it to an Apple Store if you can, then have a thing that can test the battery for you. You can get the battery replaced but you will be without your phone for a few days.

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