Question: What was the size and number battery ?

[killain]

What was the original size and AC Delco number battery that came stock in a 2003 Corvette? I trying to remember when i changed mine, but to no avail. Thank you !

 

[Toms007]

Not the size that necessarily came in your 03, but the one that C4C5Specialist says needs to be in there.

Delco Professional 78-6yr

 

[killain]

I went to the AC Delco website and started looking up batteries for my 2003 LS1, and it shows a Part # 75-7yr Professional series battery with CCA 700 SID and states that is the Original Battery. The specs on my Optima Red Top are at or higher than that !

 

[Toms007]

I went to the AC Delco website and started looking up batteries for my 2003 LS1, and it shows a Part # 75-7yr Professional series battery with CCA 700 SID and states that is the Original Battery. The specs on my Optima Red Top are at or higher than that !

Look at the 78-7year that's what Paul says needs to be installed.

 

[Yoda]

I am not one to argue with Paul (C4C5Specialist) :nono

But to answer your question:

What was the size and number battery ?
What was the original size and AC Delco number battery that came stock in a 2003 Corvette? I trying to remember when i changed mine, but to no avail. Thank you !

The "Original Battery" is still in "ABBY". I just went out to the garage and here is what it is:

AC Delco (60 Month)
ACD 75 - 60
S067P​

Bud

 

[Toms007]

I am not one to argue with Paul (C4C5Specialist) :nono

But to answer your question:

The "Original Battery" is still in "ABBY". I just went out to the garage and here is what it is:

AC Delco (60 Month)
ACD 75 - 60
S067P​

Bud

Bud, I'm thinking that the OEM battery was a 75 but that they had a better CCA rating than the current 75 series. When I bought the new battery for my 01, it showed a 75 series as well, but Paul looked at mine this past summer and the first thing out of his mouth was, "You know this is the wrong battery?" more a statement than a question.

 

[fixvet]

Bud, I'm thinking that the OEM battery was a 75 but that they had a better CCA rating than the current 75 series. When I bought the new battery for my 01, it showed a 75 series as well, but Paul looked at mine this past summer and the first thing out of his mouth was, "You know this is the wrong battery?" more a statement than a question.

I agree. I was just reading a similar thread on the CM site this week and I think Paul said GM installed a slightly smaller, in size, high rated "75 D" battery for one or two years after the '97 & '98 model years....then decided to go back to the "78 D" series again until the 2004 MY. I'm not positive which years GM used the 75 battery. My current 78DL Duralast is still going after 7 years, but I'm ready to get another one after Xmas. I can sense a bit of weakness when starting my '98 coupe with 73k miles on the clock. Still runs and looks like new!

 

[killain]

I would never argue with Paul. He is a GM master technican, but I'm wondering why the original (accourding to the current GM catalog is a 75 size battery, but to go one step futher, I picked the Optima because I was afraid of a developing a leak at one of the terminals on a AC Delco battery. AND I wanted to get a Gel or AMG type of battery. But with that in mind, when I worked in a shop, when we had a customer come in needing a new battery, we always put in the car a next in higher output battery and that was due as my boss pointed out is that as a cars electrical system gets older developes a resistance in the wiring through out the entire car. So if a cars original battery had a 650 CCA, we'd put in a 675 or 700 CCA. It's not going to affect the operation of the car, but there's a bettery backup in case it's needed. A lot of folks have either a great experience with Otima, or they hate the very word. But it's my experience that about 79% of these complaints stem from the owner installing a stereo or a Amp, and of course they used fifteen feet of Monster wire to string the whole catastrophe together. And once you hook up a battery charger to the car, the ouput needle shot all the way over to 14 volts. But that's just another "War Story" of mine. When the customer came back, he'd ask my boss if his car was fixed, my boss would say sure thing. The customer would ask what was the porblem? My boss would alway's say, "You car didn't need any one thing, it needed one of everything !". . . Oh and by the way, your radio is shot. Leave it alone or whistle to yourself."

 

[Jistari]

BTW, its not the CCA, most of the batteries discussed will do starting duty just fine. The reason (and source of the confusion) is that the original spec for the C5 was a 90 RC (Reserver Capacity) but due to parasitic draw even when parked and completely shut down it was found you will do better with a battery with a 120 RC. BTW the optima red top is not suited for the C5. Yes Im aware that we all switched to them years ago due to the AGM technology, great....still not the right battery for the C5 (RC isnt high enough and doesnt take to being discharged well, which is a likely occurrence in a C5).

All C5's are different, some draw less, some more but they all will eat a battery if left alone (not started) for long periods.

And . . .

Forget about the leaking at the terminals problem. That was confined to a certain case design that they dont make anymore. You cant buy a battery made like that in the US anymore. A $60 Walmart special is not going to leak.

 

[Hib Halverson]

What was the original size and AC Delco number battery that came stock in a 2003 Corvette? I trying to remember when i changed mine, but to no avail. Thank you !

The OE battery in an 03, both base and Z06, was a Group 75.

During the C5 years, a Group 78 was used from 1997-2000, a Group 75 from 2001-2003 and a Group 86 for 2004. A Group 75 and Group 86 are the same except that the 75 is side terminal battery and the 86 is top terminal.

Avoid Optima. They are well-marketed but, in my opinion, the quality has dropped off in recent years as the Optima brand has focused on low price and mass-marketing. Good choices are AC Delco, the higher-end Die Hards and Interstate. The best battery in the business is the Odyssey.