My first question was "but why?" and apparently it has more applications than one would think at first, as it says in the article: edible batteries in toys for kids would eliminate toxicity risk and supporting electronics that go inside our body (they are working in edible transistors).

I also wanted to highlight this hilarious phrase in the article:

> While all of these components are nontoxic and edible, the researchers clarify that a user is not supposed to eat the battery on purpose, which would obviate the whole point of making it rechargeable.

"Please don't buy our batteries for eating, eat a banana or something"