Piss powered batteries

Scientists have just developed a piss powered paper battery at the Institute of Bio-engineering and Nanotechnology in Singapore. A few drops of piss create enough power equivalent to a 1.5 volt battery. They found that they could alter the battery's performance — voltage, power, or duration, by adjusting the design or materials. Does this give hope to a future where we could recharge our mobile phones with a quick slash, drive another 50km pissing into the gas tank or take a dump in it and travel 600km ? with the price of crude predicted to reach $73 soon, lets hope that bio-fluids/fuel research accelerates !