Elon Musk Quotes:
Ocupation: Investor
Life: b. June 28, 1971
Birthday: June 28
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.
source: "Extended Interview: Tesla Motors Chairman Elon Musk". Interview with Spencer Michels, www.pbs.org. June 25, 2008. 
topic: Cells, Numbers, Challenges, High Energy
