I have the same problem as well. It will continuously drain from 90-50 in minutes and then 50-15 and so on. 1% sometimes lasts for 30 minutes+ and when I restart it will be 15+% again. I thought it might be because of custom roms so I reset it back to stock many times and same problem. The only apps I have installed are adobe reader and es file manager.
if you have such a battery drain you have different (unsatisfying) choices:
1. try battery calibration or other roms
2. throw you tab away + buy a new one
3. buy a new battery
4. accept it (like me)
5. wait until someone brings an awesome new rom which will give an awesome battery life
(sorry for hidden sarcasm but this tablet is just a big disappointment (for me))