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The battery in an X is not a "totally sealed" battery, like an
AGM style battery; thus, there is hydrogen off gassing in
the charging/discharging cycle. Those gases have to go
somewhere, so the batt. has a vent tube to discharge any
gases to outside atmosphere.
My low tech definition, but it's close, lol!
Our Xperts can add their 25Cts worth.
GL,mD
Edit: Good question on "why not a sealed one"...I've used them in
my Vette and M'cycles for years with great success.
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