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Vent plugs of various designs are used. Generally, the vent plugs are
baffled so gas can escape, but electrolyte splashed into the vent
will drain into the cell. The plugs may be screw type or push-in
type. The push-in type may be a single plug or a gang vent plug
(three-plug manifold). Most maintenance-free batteries do not vent
plugs. Instead, the gas is vented through baffled passages and small
vent holes in the cover. Most conventional batteries have flame
arrestor vent plugs. In maintenance-free batteries, the flame
arrestors are located at the exits of the baffled passages.
Only distilled water should be added to the battery.
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