mbr

I took off the cowl cover so I could clean out leaves, etc and found this hose loose. Looks like a battery vent hose, and my battery was replaced with an OEM Audi/VW battery about 6 months ago. I cant figure out where the hose goes onto the battery. There is no port on the front, top, or sides of the battery, and I really don't want to take it out to look at the back. Is it really necessary to reconnect this vent hose?
TIA

<img src="http://pictureposter.audiworld.com/46277/batteryvent1.jpg">
<img src="http://pictureposter.audiworld.com/46277/batteryvent2.jpg">

Stoney

Yes, that's the battery vent hose. You can see its hole in the lower picture.

mbr

so I didn't think it was the vent hole.

QCRAZY

That's because you don't have a factory battery. If you did, that's where that hose would connect.

mbr

It was installed by the previous owner prior to turning it in at the end of his lease about 8 months ago.

QCRAZY

I don't know what else to tell you. That is a battery vent hose....all 3 of mine have it!!

mbr

especially since this is an Audi battery. When I replaced my BMW battery a few years ago with a Sears battery, it even had the hole to plug in my vent hose.

QCRAZY

None of mine are hooked up!

Stoney

It goes in that hole! Battery usually comes with an L fitting. Work it out. ;^)

mbr

I understand why a battery that is in the trunk of the car (like in a BMW) would want to vent the battery outside, but why would a battery that is already outside need to be vented??