Biological organisms have quite a lot of energy stored in a small amount of space.
A lot of inventions were based on nature, e.g. wings for flying. Who knows, one day maybe a battery invention will also be based on biology.
A lot of inventions were based on nature, e.g. wings for flying. Who knows, one day maybe a battery invention will also be based on biology.
If we could come up with a reasonably-efficient way to produce gasoline (or an equivalent) in a renewable way, that would be wonderful, but it wouldn't be a battery.
Still, it's only half the problem. We also want an efficient and compact way to turn electricity into energy-dense chemicals. AFAIK, that doesn't exist in nature; we'd have to start from scratch.