The next stage of the competition will see the coaches whittle down the 10 singers in their team to just five, through singing battles.
Two members from each team will be pitted against each other in a duet, performing the same song on the same stage at the same time.
One singer from the pair will go on to the live shows, while it'll be the end of the line for the other.
22-year-old Ben, who joined team Jessie J on Saturday after all four coaches turned around, revealed to The Journal: “She pushed me so far out of my comfort zone it was unreal”.
“Jessie didn’t want anyone on her team who feels like they already know it all or have it made. She wants me to work for whatever I get.
“She has come up through the ranks and has had a lock of knocks along the way - she pushes me so hard. Audiences will be really surprised by the song she chooses for me in the Battle Rounds. She isn’t there to give me an easy ride - she believes in tough love and wants to get the very best from her artists.”
“She is a tough person to work with - she pushes and pushes and wants me to work hard at it. I admire that. I’ll keep working.”
Ben, who found fame as a YouTube star with piano covers of popular songs, also said he had been overwhelmed by the reaction to the show.
Close to 8 million viewers tuned in at the weekend, with Ben recalling: “Before the show I had said to my sister ‘Imagine if I get trending on Twitter’ never imagining it would happen - but I’m told for 20 minutes on Saturday night I was the number 2 trend worldwide.”
He added “Before the show I joked with my sister that it would be great if I was trending on Twitter and we thought maybe the best I would do would be to get the song ‘Rocket Man’ trending. We never expected the reaction we got. No way. I couldn’t even look at it at first.”
The Voice UK battle rounds begin on BBC One on April 20.