That may be because at Sam's they're sold under the NASCAR® Branded Product Line made exclusively for Sam's by Exide:

Exide Introduces NASCAR® Branded Product Line at #1 Warehouse Club

I have found that not all Sam's Clubs carry the same products, but have them look for the following: NASCAR XLT XDT34 and NASCAR XLT XDT35. I believe these are the numbers for which they should be looking, but I'm not totally certain. They should also be able to look up the specs for you. Also, these batteries are pretty distinctive looking in that they are made with the 3 pairs (for a total of 6) of cylindrical cells that look just like the Exide Select Orbital Series batteries and similar to the Optimas. Too, you can go to http://www.samsclub.com/ and do a search on XDT34 and XDT35 and this should bring these batteries up for you to see.

Also just as added information, according to their respective web site, the Optima Red Top and Yellow Top and the Exide Select Orbital® and Exide Select Orbital® XCD batteries are all Absorbent Glass Mat (AGM) batteries, not gel cell. There is a difference:

"All you ever wanted to know about AGM and Gel Cell batteries".

Hope this helps.

UPDATE: Just returned from Sam's a short while ago and NASCAR XLT XDT34 and NASCAR XLT XDT35 are the correct numbers for the Exide Select Orbital Series batteries sold by Sam's under their NASCAR® Branded Product Line. The label on top of these batteries has a small "Orbital" logo on it and there is a red label on the side of the battery that says "non-spillable".

 

Some have had problems, but my Red-Top has been fine.

 

Well, I broke down and got an Optima Red Top 75/35. Fit is great, looks great and best of all no more worry about leaking on the PCM.

 

I just bought my optima red top and the car feels much smoother than when I had the Delco in. Very pleased with the results but alot of green for a battery.

 

 

I decided on the excide. I ordered one on ebay yesterday. 92 bucks plus shipping.
Ron

 

Re: My previous post above.

Just returned from Sam's a short while ago and NASCAR XLT XDT34 and NASCAR XLT XDT35 are the correct numbers for the Exide Select Orbital Series batteries sold by Sam's under their NASCAR® Branded Product Line made exclusively for them by Exide. The label on top of these batteries has a small "Orbital" logo on it and there is a red label on the side of the battery that says "non-spillable".

 

Just put in an Orbital last week in my 2001 coupe. Fits nice and got it for $108 from Napa. 770 CCA!

 

Always used Red Tops in my C4's and now put one in my 02 Z06. Someone posted their Red Top exploded? How can that be possible with a dry cell battery????

 

Contrary to what you may have read on this Forum, Optima Red Top and Yellow Top and also the Exide Select Orbital® and Exide Select Orbital® XCD batteries are NOT dry cell batteries. Also, they are NOT Gel cell batteries. According to their respective web sites they are all Absorbent Glass Mat (AGM) batteries. AGM batteries use a liquid acid electrolyte and like other lead acid batteries, they can at times emit explosive gas. The difference is that in the AGM batteries the acid electrolyte is absorbed in the glass mat which makes them less likely to leak.

"All you ever wanted to know about AGM and Gel Cell batteries".

 

Is the stock battery in an 04 Gel Cell or AGM?

 

My yellow top died, wouldn't hold a charge, in less than 3 years.

No more Optima's for me.

I now have a fine $40 Kirkland battery from Costco

 

Neither. In model year 2004, GM went to a standard AC-Delco top-post sealed lead (liquid) acid battery and, as far as I know, this was the battery installed in all 2004 C5s. GM installed the AC-Delco AGM batteries beginning in model year 2001 through model year 2003. My understanding of GM's reason for going to the top-post sealed lead acid battery in 2004 was due to the number of premature failures people were experiencing with the AC-Delco AGM batteries.

Thus far, I haven't read or heard of anyone having great problems of any kind with the top post sealed lead acid battery GM used in 2004. The battery with which many people were experiencing leakage problems was the AC-Delco side-post sealed lead acid batteries that were installed in the C5 prior to model year 2001.

Hope this helps.