I think the average number of Battleground states are about 10, if you believe the polls. Personally, I don't. I think there are only 4: Florida, Ohio, North Carolina, and Virginia. The other 6: Nevada (Obama), Iowa (Obama), New Hampshire (Obama), Missouri (Romney), Wisconsin (Obama), and Colorado (Obama).
I believe Ohio, and Virginia will go to Obama, i'm not sure on Florida or North Carolina.