Yes, salt can damage batteries, especially if it comes into contact with the terminals or internal components. When salt (which is a conductor) comes into contact with the metal parts of a battery, it can cause short circuits or corrosion. This can lead to reduced battery life, leakage, or even failure.
Saltwater, in particular, is highly conductive and can cause more damage because it can create a pathway for electrical currents to flow where they shouldn’t. This leads to a buildup of heat, internal damage, and a much shorter lifespan for the battery.
So, it's best to keep batteries dry and avoid exposing them to saltwater or even salty air, which can cause corrosion over time.