B2 / botanic battery

B2 is a kind of brand new Bio-battery which can get electrical energy from photosynthesis.
The roots of plants absorb plenty of anions (such as hydrogen ions) and positive ions (most of them are metal ions).
At the same time , there are still large mounts of anions not absorbed by plants. So the B2 can generate circle current between positive and negative poles, which stored in the built-in battery to save and create more energy by fully making use of photosynthesis.