I love these new vids that apple makes. I find this one especially cool as actually see all the machinery pumping out these batteries and get and idea of how the process must've taken from having this idea, developing it, making all the machinery and sending it into mass production, just amazing, check it out:
http://www.youtube.com/watch?v=B1xvGoy2FuY
http://www.youtube.com/watch?v=B1xvGoy2FuY