If you don't want to read the article: "Battery" in its name implies that it has got electrodes in it and that's all. It's neither an energy generator nor an energy storage device -- if you were wondering.
Also here's the catch/
"The desalinated water that comes from the battery still contains too much salt for drinking, La Mantia says: “We removed up to 50% of the original salt, but we need to arrive at 98%."
It's rather interesting how the word battery came to mean chemical storage of electricity, since the original meaning of the word has to do with beating. (For example with military weapons, or with a hammer to make forged metal.)
Military weapons are indeed likely the source of the term 'battery'. Ben Franklin coined the term in reference to arrays of Leyden jars. Presumably, this was for experiments where he would 'load' the capacitors, and then quickly 'fire' (discharge) them, resulting in a spark of some kind (which probably is what led him to suspect that lightning was electrical in nature).
Also here's the catch/
"The desalinated water that comes from the battery still contains too much salt for drinking, La Mantia says: “We removed up to 50% of the original salt, but we need to arrive at 98%."