Quote:
Originally Posted by Zeke
Looking around for battery info, I found this old post. I think a gel battery does not have a provision for a vent, so no vent. Some sealed batteries have not been drilled for the vent but have a boss there for one. Don't do this yourself, buy a battery with the hookup. And use it.
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AN AGM battery, such as the Optima, does not have a vent and does not need one; which is one of the reasons is totally stops any battery tray area corrosion.