A nonmetallic (liquid or solid) conductor that carries current by the movement of ions (instead of electrons) with the liberation of matter at the electrodes of an electrochemical cell.

A battery having an immobilized electrolyte (gelled or absorbed in a material).

A battery containing a liquid solution of acid and water.

Distilled water may be added to these batteries to replenish the electrolyte as necessary. Also called a flooded battery because the plates are covered with the electrolyte.

A battery containing little or no free fluid electrolyte.