Well, in one hour the battery went down from 100% to 89%. This is with wifi and BT on and the Mail App open and set to download messages as they arrive. Not good!
Lets look at the math. That's very light usage but would still equate to about 10hrs. Battery life on an original rt. That's good but Only if you really using device also. Now if that's just its idle drainage stats, then yeah, that's kinda bad