PowerLeech Fork

Who has never, in childhood, made a "potato battery"? The experiment also works with lemons, or other things which contain juices suitable for service as an electrolyte. What is required is simply a pair of electrodes, of certain dissimilar metals. Why not commercialize this into the Power Leech (tm) Portable Charge Extractor? The device would be shaped like a stiletto dagger, with two prongs constructed from the requisite matterials (copper and zinc work, if my memory has not rotted.) The device would have many uses. People increasingly carry power-hungry portable electronics; the general decay of society should cause there to be no shortage of electrolyte containers, such as dead rats and other creatures, on the streets; pull out your PowerLeech fork, and give that cell phone a few hours of extra talk time that you need so much. In darker times, the body of your dead comrade on a nightmarish battlefield will power your radio for that extra minute necessary to summon reinforcements. Use your imagination.