It would seem the determination of whether or not a battery has vent ports is application specific. I have SLA's in my Ram 1500 and Jeep Wrangler and they don't have vent ports.
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2002 Boxster base - Seal Grey, 5spd trans.,ROW M030 upgrade, FVD Brombacher software tune
2004 550 Spyder Anniversary Edition, #1541,Tip, TechnoFix DOF IMSB upgrade
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