[s-cars] Vented Batteries?

[Varon H. Fugman]

IIRC, the MTP-91 vent hole location will end up being under the battery tie
down, but as long as you attach the Interstate vent hose kit before
installing the tie down clamp you should be OK.  It may help to trim about
1/4" off the battery end of the vent hose kit for a tidyier fit... just
don't take off too much!  (You'll probably also need to trim a couple inches
off the other end so the length is right to mate up with the Audi vent
hose.)

Make sure to get the vent hose kit with your battery!  It includes an
L-shaped rubber hose and a double barbed hose coupler.  Without it, the
factory vent hose won't hook up to the Interstate battery.

Make sure you have your 4-digit radio security code handy *before* you pull
the old battery!

Varon
'95 urS6

-----Original Message-----
From: Ian Duff [mailto:iduff at rcn.com]
Sent: Tuesday, March 11, 2003 8:34 AM
To: 'Varon H. Fugman'
Cc: 'quattro S List (E-mail)'; 'Peter Schulz (E-mail)'; 'Chris Miller
(E-mail)'
Subject: RE: [s-cars] Vented Batteries?


Thanks! Sounds like the MTP-91 it is. Another lister indicated potential
problems with the vent on the MTP-91 being obstructed by the battery tie
down. Any thoughts?
-Ian Duff.
-----Original Message-----
From: Varon H. Fugman [mailto:vfugman at globaldialog.com]
Sent: Tuesday, 11 March 2003 09:32
To: Ian Duff; quattro S List (E-mail)
Cc: Peter Schulz (E-mail); Chris Miller (E-mail)
Subject: RE: [s-cars] Vented Batteries?


If you use the MT-41, tell your rear seat passengers to be careful with the
seat heater!

Seriously, because the battery is inside the passenger compartment, you want
the MTP-91 which is set up for a vent hose.  The MT-41 doesn't use a vent
hose, but it isn't a sealed battery either... the hydrogen gas produced
during charging has to go somewhere!  Make sure to ask for the "vent hose
kit" with the MTP-91.  This is a short hose that goes from the center vent
location on the MTP-91 over to the Audi factory vent hose location at the
end of the battery.

If you want to avoid the venting issue, you might consider the Optima sealed
battery that some listers have used.  I believe this is a sealed lead-acid
gel-cell design.  However, it will be more expensive, and I've been told
there are issues with gel-cell batteries not fully recharging if you do a
lot of short-trip driving.  But no acid or hydrogen gas to worry about.

Varon
'95 urS6 with MTP-91
'99 9-5 Wagon with MTP-91

-----Original Message-----
From: s-car-list-admin at audifans.com
[mailto:s-car-list-admin at audifans.com]On Behalf Of Ian Duff
Sent: Tuesday, March 11, 2003 7:50 AM
To: quattro S List (E-mail)
Cc: Peter Schulz (E-mail); Chris Miller (E-mail)
Subject: [s-cars] Vented Batteries?


Looking for a battery. Interstate seems to be the consensus. Their website
indicates two choices, the MT-41, which appears to not be vented, or the
MTP-91, which appears to be vented. The MT-41 is priced at $78.95, the
MTP-91 is priced at $95.95. Scott Thompson replied to my earlier post that
in his research, the MT-41 lacks a vent. Brian Montgomery replied saying he
has an MTP-91, vented, and it's been fine for him. Given that the S6 needs a
type 41 battery, the MT-41 seems to be both cheaper and the correct
configuration, but lacks a vent. Anyone with an opinion as to how important
the vent is? TIA,
-Ian Duff.


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