S2·E6 The Battles Begin
Aired March 5, 2012
Synopsis
The battle round kicks off with team members dueling in duets and the coaches enlisting help from such star mentors as Jewel, Lionel Richie, Alanis Morissette, Robin Thicke, Kenneth "Babyface" Edmonds, Ne-Yo, Kelly Clarkson and Miranda Lambert.