A battery by definition is a collection of cells. So the cell is a little can of chemicals. And the challenge is taking a very high-energy cell, and a large number of them, and combining them safely into a large battery.
I can remember the time I would get my scripts and spent the entire weekend breaking them down and playing with them, and putting a lot of work into them, trying to bring the character to life, and to make interesting choices. It was one of the things to me that told me that I needed to change things up a little bit, because to me, I felt the passion was lacking from some of my performances.