Jungheinrich EZS 350 Operating Instructions Manual page 122

NOTE
If an installed electrolyte circulation system is seldom used or not used at all,
or if the battery is subjected to severe temperature fluctuations, the electrolyte
may flow back into the hose system.
Attach a separate coupling system to the air inlet line, such as: locking coupling on
the battery side and through-coupling on the air supply side.
Schematic illustration
Electrolyte circulation on the battery and air supply via the charger.
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