I have the same phone and it lasts me about 16 hours on battery from 100%-0%. I just charge it up every night and drain it till it's almost dead every day. It lasts me the whole day, but it's a far cry from my old blackberry's battery life which would last 2-3 days. Anyway, I find that if I restart the phone it lasts longer for a couple days. So I just restart it every few days. I don't use it too much, I read emails on it, I text a lot, and I visit a few web pages, but I'm not a heavy user. The screen and the CPU drain the battery the most, my power saving mode is always on. As soon as I turn it off the battery drains like yours Zay. Word on the street is that Android 4.1 should improve battery life but I'll believe it when I see it for myself.