Leaf-Eating Robot (Help)

[CraftMaster25]

Okay, so I've heard about how some of the stealth/smaller robots contain bacteria in them that eat leafs, the the energy the bacteria uses charges up the battery or something . So, what I think is that if I could get some common bacteria and put it in a container on a stealth robot, then have it charge the battery, that would eliminate the need to charge for two-ten hours and eliminate the weeds in your yard. If you have any idea on how to get those bacteria hooked up to charge a battery please post a reply! Thanks.

[Razor Concepts]

Microbial fuel cell
http://en.wikipedia.org/wiki/Microbial_fuel_cell

However they are not very efficient at the time being, so making a powered robot through this kind of fuel cell is not feasible

[corrado33]

However, it would be cool to maybe power a simple transmitter of some kind, so that if your bot gets lost in the woods you can still find it.