Treehugger recently reported that there is a battery that runs on urine and has the ability to create enough of a charge to power a laptop for over four hours.
Designed by a South Korean company, the MetalCell, which also runs on salt water, uses magnesium plates which react with sodium to generate a small amount of electricity.
This portable device is designed primarily for military use or when electricity is in short supply. The standard MetalCell model costs about $200.
So, if solar or wind isn't a viable option and you need a portable battery, you might want to keep an eye out for this. I say using it power my laptop would help mitigate the global impact of all this blogging and Facebooking.
Would you be willing to use your pee to power your iPad, phone or laptop?