How much battery life in Samsung Galaxy S4 and is there a T-mobile lollipop upgrade?

I am getting a Samsung galaxy s4 and I was wondering, how much battery life do you get in one? like in hours of heavy usage and standby?

and while I'm at it, it is a T-mobile s4 and it says it will come as android jellybean, and I was wondering, I know T-mobile has a kKtKat upgrade, but is there a lollipop upgrade? If not I can take my phone to Best Buy and have them upgrade it, but I was wondering if there is one?

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