What do you mean “no”? You’re going to need to if you’re planning on using your phone again. The old cells are dead so in this tutorial we can see how to whip them out ready for some shiny new cells.
One thing I forget to mention in the tutorial is the slight, sweet smell. Yeah that’s gas escaping from old and decaying cells. Wear a mask and don’t breathe too deeply. Get them out and recycle responsibly. Happy cell-pulling-out day.