Quote:
Originally Posted by B328iC
That "weep" is actually a vent hole. It's intended to allow gases to escape as the battery charges. Usually there is a plastic piece in there connected to a rubber hose to properly vent them from the battery box area. If not vented correctly it will cause premature damage to the battery box as the fumes & liquid are corrosive.
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There's usually a vent on the other side of the battery as well so the vent hose is probably connected on the other side. Usually there's a plug in the vent holes on both sides of a new battery so the installer can select which vent to use for hose routing when putting the battery in. The venting hose is also meant to expel battery fumes outside the vehicle so you don't breath them in.