iPhone 4S to iPhone 5S upgrade?

I've had an iPhone 4S since Feb. 2012, and i can upgrade in Feb. 2014. I am wondering whether I should get the iPhone 5S or just wait another year for the next iPhone. My battery life is horrible(around 2.25 hours with minimum use), everything is a little laggy, and I think the 5S is a good choice, but not sure.

Any opinions on what I should do?

Thanks,

FL