It will be the same trust me , some people say it does improve but nope they just disable functions etc maybe you have 5 email accounts "pushing" along with push notifications from several apps active.
To be honest the best way to see improvents to battery life just disable the % option
Last Summer I noticed my phone getting hot and the battery was draining very quickly. I could not figure it out for 3 days.
Then i remember I clicked on sync sent mail on my exchange account and something got stuck. I turned that off and the battery was great from there on.
Now on my 4S I kept all settings the same, and I can get about 5 1/2 to 6 hours of usage which I am OK with. I have push notifications on for 8 apps, GPS on for a couple of apps, and of course an exchange account.