Touch Enabled Business Card

I like the idea and I want to steal it, but are there any options for super-thin batteries? Something that would be literally paper-thin.

Here is another good idea for Touch Business card <a href="http://www.youtube.com/watch?v=v3QVdMkg1cs" rel="nofollow">http://www.youtube.com/watch?v=v3QVdMkg1cs</a> (More relevant to the purpose of the card)