Acer Iconia Tab 8 higher capacity battery?

Hi everyone. I have owned this Acer tablet for about a month now. No complains whatsoever. Really good performer. Only major downside so far is the short battery life.
I have been trying to find a higher capacity battery for this tablet or a way to increase battery life. While typing this I have started wandering with the idea of rooting this device to see if there is any battery life improvements.
Well, in the meantime, it would be great to find a higher capacity battery somewhere around.
Thanks for any response.