Glenn M

Looks like a killer deal for $115.
Which one fits the 928?

Formula94lt1

Oreilly's has an Optima equivelant, part is a super start 49 AGM that is an exact fit for any 49 series battery like the one in my 86. AGM stands for absorbed glass mat. I get it for 110 with my discount

S4ordie

Great price but someone needs to confirm fitment in our 928 battery box as well as cables being able to be connected without issues. If that can be done, I will order two and I bet there are many others on here who will do the same. Lots of poor experiences with batteries that were close but not quite right.

AGM is the way to go. Have four very large ones on my boat.

Maleficio

I've had a red-top in my Isuzu Trooper for five years, and it is the best battery I've ever owned. I wonder why no other battery manufacturers are competing in any way?

bernard farquart

They are, Exide has had an AGM spiral cell battery for five or six years, sold under the "Orbital" name.

Formula94lt1

They fit, I work at Oreilly. SSB 49 AGM is the part number, we keep one in stock at all times. Just waiting for my battery to go bad so I can get one.

S4ordie

Do you own a 928? If yes, what model? The battery issues with our cars are not insignificant. Some examples of fire due to terminal connections rubbing against metal. The battery must be specific in dimensions so the hold down clamp can be used.

Still waiting for a 928 S4/GTS owner to confirm there are no fitment issues. I am happy to buy when that is done.

toofast928

The Doctor is correct, using the Autozone battery fits perfect and will last 5 years or more. I'm also using it 2 years+ and no complains.

This is one area of the 928 I would not deviate from Porsche for fear of a car fire.

JPTL

This thread is very topical in my case, considering just yesterday my Duralast 48 D battery needed a jump after not being on a tender for only a week or so. I bought it 7 years ago, so I suppose I'm due.
Re: the AZ batteries, they're now showing a completely different battery, an H6-DLG that may have a bit longer warranty, but is 2 1/2 times the $59.99 that I paid for the 48D in '03. Is the 48 D still available at AZ, or have they been replaced by the pricey H6?
Since I can't look up batteries by group number, and they're only showing one battery for a 928, I'm concerned that they won't guarantee a 48 D - even if they still have them.
Any suggestions?

Franks928s

Great dialog and info sharining on the optima special that is underway!. Can someone share what red top model they use in their S4? I have a 1987. Thanks!

SeanR

Had a couple of PM's asking, 7586DT is the model number and the part number is 75-25.

JPTL

..so Sean, the 7586DT fits in your '88 S4 without a cable mod & w/out the need to insulate the posts to keep them from contacting the batt. cover?

SeanR

I do have a plastic cover over the top of the battery 'just in case'. Been running the same model for 4 years. I will say that I replaced the positive cable connection when I got the car due to the PO of the PO screwing it up with a buttload of amp cables attached to it and it was trashed. It is the same as the factory one though. But everything seems to be fine.

JPTL

Thanks Sean. Even though my old Duralast has been taking a charge for the last 12 hrs. I have to assume it's days are done. It doesn't owe me anything.
Since Optima has such a great reputation, why go with anything else - especially if the Optima is $30 less than the AZ alternative?
I went ahead and ordered a certificate from "Cup Daddy". I'll report how everything goes...from getting the certificate, ordering the battery, to fitment in a '91 GT.
BTW, I didn't see any reference to a 7586DT on the Optima site, but did find a reference for a 75/25 Redtop.

Champagne

I have the same Optima model as Sean in my S4 and I do keep an isolation pad on top, but otherwise, no problem for fitment or cables.

Been running it for years.

Paul