1. A device that converts chemical energy into electrical energy by passing current between a negative electrode and a positive electrode, through an ionically conducting electrolyte phase.

Relating to or containing matter in the form of charged atoms or groups of atoms.

2. A device containing two conducting electrodes, one positive and the other negative, made of dissimilar materials (usually metals) that are immersed in a chemical solution (electrolyte) that transmits positive ions from the negative to the positive electrode and so forms an electrical charge.

One or more cells result in a battery.