Definition
A type of electrochemical cell in which the electrolyte is in liquid form. In aviation, the most common example is the lead-acid battery cell, where lead plates are immersed in a liquid sulfuric acid and water solution that conducts electricity between the plates.
Plain English
A battery cell that uses a liquid chemical mixture inside it to make electricity, rather than a paste or gel.
Context Anchor
Seen in aircraft electrical system descriptions, battery maintenance, and preflight or servicing discussions.
Derivation
Called 'wet' because the electrolyte inside is a liquid you can pour, as opposed to a 'dry cell' where the electrolyte is held in a paste so it cannot spill.
Why Pilots Care
Wet cell batteries deliver strong starting power but require regular electrolyte level checks to avoid corrosion or failure.
Intuition Check
Do not read “wet cell” as a battery that accidentally got wet. Here, “wet” means the battery cell is designed to contain liquid as part of how it works.
Example Sentence 1
The aircraft's lead-acid battery is a wet cell design, so it must be kept upright to prevent the electrolyte from leaking.
Example Sentence 2
The mechanic replaced the aging wet cell with a sealed unit to reduce maintenance needs.