To promote the song, Sparks performed on televised shows which included American Idol and Good Morning America.

The song has been covered by English alternative rock band Fightstar which was performed on the television show One Life to Live.

[3] During an interview with Digital Spy, Sparks revealed that while she was in the studio working on another song with Wilkins, he asked her if he could play her a demo of "Battlefield".

[21] The song's lyrics revolve around "a tumultuous relationship where neither side wants to compromise", as stated by Jocelyn Vena of MTV News.

[22] Bill Lamb of About.com awarded "Battlefield" four-and-a-half out of five stars, writing, "'Battlefield' is the kind of song that screams instant hit from the first time you listen [to it].

[17] A writer for The Insider stated that it was one of the songs on the album that proved why she won the sixth season of American Idol.

"[25] Adam Knott of Sputnikmusic called it "a massive, epic pop song", that is Sparks' best single release to date.

[22] Gavin Martin of Daily Mirror called "Battlefield" one of the most "epic metaphoric ballads" ever made by Tedder.

[28] Michael Slezak of Entertainment Weekly described "Battlefield" as "gorgeous", writing, "when Sparks hits that 'Better go and get your armor' bridge, you can practically feel the wind whipping through your hair.

"[29] Johnny Dee of Virgin Media wrote that it was one of the song's "you cannot help but reach for any available nearby hairbrush and sing along to", despite calling the bridge a "clunking pedestrian pace and corny advice".

[30] Sal Cinquemani of Slant Magazine stated that "Battlefield" is as catchy as "Halo" and Leona Lewis' "Bleeding Love" (2007), and noted that the song's production was similar to Pat Benatar's "We Belong" (1984).

[40] The song was certified gold by the Recording Industry Association of New Zealand (RIANZ), denoting sales of 7,500 copies.

[42] The song was certified platinum by the Australian Recording Industry Association (ARIA), denoting shipments of 70,000 copies.

[51] The music video for "Battlefield" was directed by Philip Andelman and filmed at the Golden Oak Ranch in California.

During the song's bridge, she warns her love interest to "get his armor", as she appears to be surrounded by flashing lights and smoke.

[56] In June 2009, Sparks became a support act for the Jonas Brothers' world tour and performed "Battlefield" with the band.

[60] In August 2009, Sparks performed "Battlefield" during Britney Spears' North American leg of her Circus Tour, in which she served as a support act.

[62] On July 23, 2009, "Battlefield" was covered by English alternative rock band Fightstar on BBC Radio 1's Live Lounge.

[64] In May 2010, "Battlefield" was covered by the ABC television show One Life to Live in the musical episode "Starr X'd Lovers".