I wonder if the "microbial fuel cell" they mention is actually any better then a normal battery pack of the same size. If it does't do any kind of waste disposa

I wonder if the "microbial fuel cell" they mention is actually any better then a normal battery pack of the same size. If it does't do any kind of waste disposal, I imagine it has a limited lifespan - so we have to ask if it is longer or shorter then the non-flesh-eating kind.