Personally, I skipped this step and everything still works fine. I wasn't able to take the battery out because the adhesive was too strong.

When you are putting these cables back, make sure to check the orientation of the cable. You have to match the cable head to the entry point, so you may have to turn the cable around. I spent a bit too much time trying to connect the cables just because I didn't realize that I had to turn the cable around.