will.i.am, Tom Jones, Jessie J and Danny O'Donoghue can only take half their acts through, so in each battle, one act loses and leaves the competition forever.
[The Voice UK Battle Rounds - In Pictures]
However, in a new twist to the series, each coach has one chance to 'Steal' an act. Each coach can grab one contestant that another coach kicks off the show.
So nobody wants to make the wrong decision and end up losing a potential Voice champion.
The Voice UK first Battle Rounds air at 8.35pm on Saturday (May 11) and 7pm on Sunday (May 12) on BBC One.