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Bottom line: Even though AC Delco lists Group 90 batteries as being compatible with 2006-2007, and 2010-2013, base Corvettes, their Group 90 doesn't fit my 2012 and I suspect that Group 90 probably doesn't fit any of these models.
Scenario: The second battery in my 2012 base failed. Perhaps I'm silly, but I prefer to keep things original, so I went to my local Chevy dealer parts counter to buy an AC Delco battery. They gave me a Group 90PS and assured me that this is the battery specified for my vehicle. I thought that to be odd, because they sold me an AC Delco Group 85 a few years ago (the one in my car that had finally died), but they certainly know what fits. After over an hour of trying to get the bolt to go through and secure the little battery hold-down clamp, it finally hit me that something is amiss. This is hard to explain, but the battery is secured by the little hold-down clamp on the front side, and a thin flange on the bottom of the battery fits into a thin lip on the back side of the battery box (which holds down the back side of the battery).
A challenge is that you can't see the back side of the battery box as you are installing the battery (which doesn't exactly drop in). After using a little mirror and flashlight, I concluded that the flange on the bottom of an AC Delco group 90 Battery is too fat to slide into the thin retaining lip at the back of the battery box. Comparing both batteries on my workbench confirmed the 85 has a thin lip while the 90 has a thick (fat) lip.
I was tired and pissed by this time, so I drove my wife's car to my nearby O'Riley's and bought their house brand Group 85, which fit and worked fine. Returned the AC Delco to dealer the next day and got a refund because I hadn't yet removed the little terminal post protectors.
Tell me that Group 90 really does fit, and I'm just an incompetent shade tree mechanic.
Interesting about battery sizes listed in this thread. Autozone lists OEM size as 42/T5. I’ve had my 2007 base coupe 3LT for over 3 years now. When I bought the C6, I bought a Battery Tender Plus 1.25A charger. When the car sits for longer periods. It is on the charger. I always park my manual gear box with parking brake set and in R. The battery in the car when I bought it was a Duralast Gold T5. 90A, 650 CCA, 810 CCA. It’s still cranking and running fine. I really wanted to comment on battery terminals. To me OEM terminals look not so good. They just barely clamp and I worried they might vibrate loose. I’ve recently installed COROTC 0/4/8/10 terminals with plastic covers. They come with terminal shims that I did not use. The terminals are great and zinc plated for good compatibility with the battery lead posts. The plastic covers complete a clean installation. I’m feeling better about the mechanical and electrical integrity of the new terminals. T5 Duralast Gold in C6 base coupe C6 factory battery terminals
I believe group 35 and 85 agm batteries are the same/interchangeable. I found out the hard way and paid for a group 85 for my Vette. I had to buy a group 35 for another vehicle. They are exactly the same in size and specs. I paid a lot less for the group 35. Sam's club has a Duracell and it is labeled 35/85 AGM. Costco in Canada at some stores at least has group 35 agm for a very low price.
I had to replace my battery last July, and I decided to salvage part of the old clamp, I cut it off, Drilled a 5/16 hole and bolted it to the new clamp. This picture isn't the best, but you can see I think what I did, I used Marine clamps.
My 2006 C6 Base Coupe has a 90 (T5) in it. The battery has failed and am trying to see what battery to order for it. Here the previous messages say an 85, but as you can see, mine has a 90 in it. Have no clue what the T5. means.....I am sorta upset, this battery only lasted 5 years.
Last edited by MCharlie; Dec 21, 2023 at 05:14 PM.
I'd just go to Costco, Walmart or Sams and look at their chart. I did a cursory review and it looks like a 2006 uses a T5. All C6 Corvettes do not use the same battery. The obvious is check your owners manual if you have one or get one on line. They're usually free. By the way I believe 5 years is average or good life in the Nevada heat.
I'd just go to Costco, Walmart or Sams and look at their chart. I did a cursory review and it looks like a 2006 uses a T5. All C6 Corvettes do not use the same battery. The obvious is check your owners manual if you have one or get one on line. They're usually free. By the way I believe 5 years is average or good life in the Nevada heat.
Yup...that's what I am doing..I got that battery at Sam's Club 5 1/2 years ago. Just made an appointment to get it replaced tomorrow morning.
Not real excited about spending the money on a battery this close to Christmas, but.....mm
MC
Welp.....
Gonna have to wait until after Christmas now....Lots of rime ice on the roads this morning.....My Corvette and ice do not like each other. I did a full recharge on the battery, it started just fine this morning, and I will keep it on the trickle charger I hate having to reprogram all the memories in the radio. Don't know why the battery was depleted so. Nothing was open or left on and it had only been 4 days since I last drove the car. It could very well be hidden corrosion at the terminals. I noticed when I put the big charger on the battery, It would not charge with the clamps on the terminals. I had to connect the ground clamp to the engine itself.
Yup...I do patronize Kragen's (O'Reilly's) here in Reno. Have a commercial account with them. As I am very happy with the Duracell battery that Sam's Club put in the car for me 5 1/2 years ago, I am going to stay with it/them.
If it fits in the tray, not too tall, pos and neg posts are oriented right, and cranking and reserve amps.....a battery might work.
The Interstate Battery site says the T5 fits 2006-2013 C6. 9-1/2 x 6-7/8 x 6-7/8 high. Same as Group 90.
Having the same problem as the OP--got a 90 series battery to replace the 85 series on my 2011 C6 and I think the flange on the back of the battery is too think to fit under the retaining lip on the battery tray. I don't want to return the 90 so I think I'm going to cut a bit off the top of the battery flange to get it to slide further under the retaining lip.
Bottom line: Even though AC Delco lists Group 90 batteries as being compatible with 2006-2007, and 2010-2013, base Corvettes, their Group 90 doesn't fit my 2012 and I suspect that Group 90 probably doesn't fit any of these models.
Scenario: The second battery in my 2012 base failed. Perhaps I'm silly, but I prefer to keep things original, so I went to my local Chevy dealer parts counter to buy an AC Delco battery. They gave me a Group 90PS and assured me that this is the battery specified for my vehicle. I thought that to be odd, because they sold me an AC Delco Group 85 a few years ago (the one in my car that had finally died), but they certainly know what fits. After over an hour of trying to get the bolt to go through and secure the little battery hold-down clamp, it finally hit me that something is amiss. This is hard to explain, but the battery is secured by the little hold-down clamp on the front side, and a thin flange on the bottom of the battery fits into a thin lip on the back side of the battery box (which holds down the back side of the battery).
A challenge is that you can't see the back side of the battery box as you are installing the battery (which doesn't exactly drop in). After using a little mirror and flashlight, I concluded that the flange on the bottom of an AC Delco group 90 Battery is too fat to slide into the thin retaining lip at the back of the battery box. Comparing both batteries on my workbench confirmed the 85 has a thin lip while the 90 has a thick (fat) lip.
I was tired and pissed by this time, so I drove my wife's car to my nearby O'Riley's and bought their house brand Group 85, which fit and worked fine. Returned the AC Delco to dealer the next day and got a refund because I hadn't yet removed the little terminal post protectors.
Tell me that Group 90 really does fit, and I'm just an incompetent shade tree mechanic.
I've had at least seven batteries in my 08....85 series.Call AC delco.
Optima Red35. $214.99 through my work at O'reilly Auto Parts. ($269.99 retail) It was $203.99 from my Interstate Battery distributor. 3 year free replacement and if they replace it, the warranty starts over.
Optima Red35. $214.99 through my work at O'reilly Auto Parts. ($269.99 retail) It was $203.99 from my Interstate Battery distributor. 3 year free replacement and if they replace it, the warranty starts over.
Thats real good our warranty starts on original purchase date. So if you warranty the battery 35 months after original purchase. the warranty ends at the end of 36 months. at Oreilly it would not give in affect 6 years. So that's a real good deal. I would clarify that warranty. Thanks Jeff
Bottom line: Even though AC Delco lists Group 90 batteries as being compatible with 2006-2007, and 2010-2013, base Corvettes, their Group 90 doesn't fit my 2012 and I suspect that Group 90 probably doesn't fit any of these models.
Scenario: The second battery in my 2012 base failed. Perhaps I'm silly, but I prefer to keep things original, so I went to my local Chevy dealer parts counter to buy an AC Delco battery. They gave me a Group 90PS and assured me that this is the battery specified for my vehicle. I thought that to be odd, because they sold me an AC Delco Group 85 a few years ago (the one in my car that had finally died), but they certainly know what fits. After over an hour of trying to get the bolt to go through and secure the little battery hold-down clamp, it finally hit me that something is amiss. This is hard to explain, but the battery is secured by the little hold-down clamp on the front side, and a thin flange on the bottom of the battery fits into a thin lip on the back side of the battery box (which holds down the back side of the battery).
A challenge is that you can't see the back side of the battery box as you are installing the battery (which doesn't exactly drop in). After using a little mirror and flashlight, I concluded that the flange on the bottom of an AC Delco group 90 Battery is too fat to slide into the thin retaining lip at the back of the battery box. Comparing both batteries on my workbench confirmed the 85 has a thin lip while the 90 has a thick (fat) lip.
I was tired and pissed by this time, so I drove my wife's car to my nearby O'Riley's and bought their house brand Group 85, which fit and worked fine. Returned the AC Delco to dealer the next day and got a refund because I hadn't yet removed the little terminal post protectors.
Tell me that Group 90 really does fit, and I'm just an incompetent shade tree mechanic.
I tried the 48 and the 95 series they fit the battery tray,but was to tall and could not open the door to the cabin air filter.
I tried the 48 and the 95 series they fit the battery tray, but was too tall and could not open the door to the cabin air filter.
If you have a Base model 2008 it uses Group 35 in engine compartment. I can and do change my cabin air filter every 1000 miles with absolutely no issue's at all. You can see the cabin air filter door and easy access.
If you have a Base model 2008 it uses Group 35 in engine compartment. I can and do change my cabin air filter every 1000 miles with absolutely no issue's at all. You can see the cabin air filter door and easy access.
My vette is a 08 base and i brought it with "0" miles on it, it had a 85 G series part #88866261 now days,after that battery died i went with Advance batteries (Two) 85 series then i switched to Autozone batteries and I'm on my 2nd one now.85 series.It is very easy to check on the web to make sure I get the right battery.So are you saying I don't know what battery my vette uses from the factory and i take my cabin air filter out every six months and clean it and change it about every year or so with no problem. If you google 35 series series for a 08 vette base Autozone Said this will not fit your 2008 corvette,others will say the same...The reason is the terminals are wrong.
Last edited by Cherokee Nation; Mar 14, 2024 at 12:08 AM.
Reason: add more
C6 battery compatibility
and i take my cabin air filter out every six months and clean it and change it about every year or so with no problem. If you google 35 series series for a 08 vette base Autozone Said this will not fit your 2008 corvette,others will say the same...The reason is the terminals are wrong.