John in Ark

The Audi dealer says the Audi batteries have some kind of special venting. Any reason to go with a battery from the dealer? What's the best sears battery to get, their web site of course says the most expensive one.

99.5 A4 2.8 quattro

Bert

The positive post on the OEM Audi battery is towards the driver's left. The only battery on Sears site that is oriented this way is the most expensive ( of course ). You can always use a "conventional" battery and have the terminal posts closer to the passenger compartment and see if your existing battery cables will reach. Or you can relocate the ground cable for the proper orientation. (The positive cable is actually routed from passengers side, driver's right, to drivers side, driver's left.)

HTH,
Bert

RKA

For most cars, Sears offers a choice of several different batteries, for A4's, you have to get the "International" battery. I believe it does have a drain, just like the stock battery. Go to your local Sears and check to make sure the drain tube is there.

jbaulsir

<center><img src="http://pictureposter.audiworld.com/6016/vent.jpg"></center><p>running under the positive battery wire. I think it vents hydrogen gas produced when charging.

I have no idea where the other end comes out.

S4iowa

$85. Also the tube on the battery is a vent for gases not for fluid.

RKA

Ahh, thank you!

RKA

Question: What creates the gases, and how do sealed batteries work?

jbaulsir

but check page three for the chemistry.<ul><li><a href="http://www.howstuffworks.com/battery.htm">http://www.howstuffworks.com/battery.htm</a</li></ul>

Bert

Optima R34 orange top.<ul><li><a href="http://www.optimabatteries.com/products/starter/technical.asp">Click on the R34 spec after this</a></li></ul>

S4iowa

basicly the sealed batterys are classified as a Gel-Cell.<ul><li><a href="http://www.4unique.com/battery/battery_tutorial.htm">http://www.4unique.com/battery/battery_tutorial.htm</a</li></ul>