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'13 CTS-V wagon WD graphite 6 MT Corsa Sports CAI
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Discussion Starter #1
I'd like to upgrade. Our cars demand too much from the stock battery. When the car is awaken, after sitting more than a few days in the winter, voltage draws down by close to a volt, and we have to start with a nearly dead battery.

I've researched the subject of replacement to death and understand how to protect the electronics and restore any lost settings if I install a battery myself. It's access where I need advice, particularly for the vagon. Has anyone replaced the battery through the access door in any model? The vagon has the largest opening but possibly still too tight a fit. The factory manual describes removing the side panel after removing two moldings, a frame, compartment cover,and sill plate. Is this necessary and does it require special tools? Any tricks to removing fittings? The sedan requires removing the back seat. If I can't do it I guess the dealer is the only one with enough experience to trust and I'll have to live with the OEM battery.

If I can perform the service myself I'd like to install an Odyssey 1200. The website says this may require some modification though. Anyone have one? With all that's involved I should be good for at least five years and can dispense with the Tender. I don't see the advantage of an Optima but it's an option as the Yellow Top may handle draining better than the AC Delco unit. Optima appears to have declined in quality since they moved production to Mexico. Some think they don't require venting, but that's not true. They do offer batteries with ports for venting. All batteries, even AGM, vent gas if they get hot or are charged over 15V. Location under a fuse box in our cars invites corrosion and possible explosion if the battery is not vented properly.

In short I'm asking if anyone has installed an aftermarket battery that they feel is superior to OEM, pitfalls, fitment, venting?
 

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2011 CTS-V A6 Sedan Modded :)
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710 Posts
Removing the side panel is pretty simple and makes the process MUCH easier.

I put a Duracell AGM in my sedan last year. I road race so wanted a dry battery. Cranks strong but it's only a year old. It fit perfectly and no venting necessary as it is dry.
 

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'13 CTS-V wagon WD graphite 6 MT Corsa Sports CAI
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183 Posts
Discussion Starter #3
Tell me about the fasteners. Are they just screws? Do you have to pry up moldings? You say "much easier". Does that mean that it would fit through the access door? Optima AGM is sealed and dry but they state in the FAQ that you still have to vent them. So the Duracell fit perfectly in the restraints?

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cruiser 68,

I'm interested in the Duracell since it fits. I went to the website and, sure enough, the AGM 48 which our cars take requires venting. Did you see any provisions for venting?
 

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2011 CTS-V A6 Sedan Modded :)
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710 Posts
IIRC the battery had one hold down block at the base. There was no vent on the Duracell so no venting :) Regarding pulling the side panel...on my sedan there were a couple screw in anchors on the side then it just pulled away from the battery. You could do it with just the access panel but it was much easier with the whole panel pulled to the side.
 

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2014 CTS Vsport Premium
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550 Posts
Check out the Die Hard Platinum - same as the Odyssey, but a little cheaper and a whole lot easier to find
 

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Had 2009 V, Red/Blk 2016 Now
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Cheaper yet, Farm & Fleet Platinum for a 3-year replacement. I love their batteries.
 

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I'd like to upgrade. Our cars demand too much from the stock battery. When the car is awaken, after sitting more than a few days in the winter, voltage draws down by close to a volt, and we have to start with a nearly dead battery.
I never had a problem with the stock OEM battery. Can't imagine why you call it nearly dead. Maybe you got a dud.

When I just replaced my Yukon battery, the salesmen in Sears told me NOT to by the platinum. He said more of those come back than any diehard he ever sold.
 
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