Mystery air hose? by battery in 360? Can someone help identify?

That is the overflow drain hose for the battery. It should plug into the battery and drain downwards.

 

Overflow? I thought it is used to vent hydrogen.

 

Hydrogen is not easily contained by battery cases or plastic tubing....it readily escapes through most seals. While I suppose there may be some intent to vent Hydrogen with that line, it is really for the rare event of an overcharged, overfilled or agitated battery venting fluid. Here is a typical patent for such a design: http://www.google.com/patents?id=spcUAAAAEBAJ&zoom=4&pg=PA1#v=onepage&q=&f=false

 

They are required on batteries placed in the interior to vent hydrogen. Those batteries have more than enough interior space for fluid expansion.

 

The MTP-91 Interstate battery comes with vent tubes that connect to the OEM vent.

Quite important to have connected.

 

He just wanted to know where the hose goes not the anatomy of a battery.

 

And you informed him. But you did not stop there without misinforming him its reason for being so we really have you to thank.

 

Where does the hose vent through, when i pulled the battery out unfortunately the hose came with the battery

 

Most likely through a hole to the ground. I thought it was for fluid as I've seen battery trays in other cars rusted when the tube is not connected. Hydrogen should just float away.

 

Am I wrong... but do these "sealed" batteries even need that? Is there even a vent port on the battery for it ?

 

According to the interwebs, even sealed lead acid batteries could encounter circumstances which cause out gassing.