This is how I play it, I don't know if it sounds right to you, but these chords 
work perfectly fine on my guitar:-) 
don't forget to check out my youtube channel http://youtube.com/maikenwish0 

Jordin Sparks - Battlefield 

Capo: 3rd fret (you can put it where ever you want,I use it on 3rd) 
Verse1. 
Em                                        D
Dont try to explain your mind I know whats happening here 
Em                                         D 
one minute its love and suddenly its like a battlefield
Em                                         D
one word turns into a war why is it the smallest things that tear us down
Em                                                  D 
my world is nothing when your gone im here without a shield can't go back now C 

pre-chorus.
C             G                    D 
Both hands tied behind my back for nothing 
C                G                    D 
These times when we climb so fast to fall again why we're gonna fall for it 
 C 
now 

chorus. 
USE THESE CHORDS: C,G,D THROUGH THE WHOLE CHORUS AND PRE-CHORUS AND ON THE VERSES 
YOU USE Em,D THATS IT :-) 

GOOD LUCK! 
chorus: