How is Battery life on an iPhone 5s purchased brand new with IOS8?

I'm upgrading to a new iPhone soon, I don't care much for the look or size of the iPhone 6 so I wanted to move to a 5s. But the only thing that might make me move to the 6 is battery life. If you've purchased the phone brand new running IOS 8, can you tell me if the phone still runs good?

It runs fine, but the battery life isn't overly good.

That depends on the user. I have a Android phone that I only have to charge once a week. Because I do not keep my data or Wi-Fi on unless I'm using them. I also limit my app usage.

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