Draining Battery
Thread Starter
4th Gear
Joined: May 2025
Posts: 5
Likes: 0
Draining Battery
Hello Fam,
I have an issue where I purchased a new battery from the dealer a couple of weeks ago and its still being drained somehow by my car. It starts up easily most times but after driving it drags.
Please advise\Thanks
Sam
I have an issue where I purchased a new battery from the dealer a couple of weeks ago and its still being drained somehow by my car. It starts up easily most times but after driving it drags.
Please advise\Thanks
Sam
Thread Starter
4th Gear
Joined: May 2025
Posts: 5
Likes: 0
Well, I had purchased other batteries and thought maybe, that was the problem, so I went to the dealership. I know that got me..LO. Where do you normally purchase your batteries?
Moderator, Tech Contributor
Joined: Sep 2013
Posts: 15,544
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From: Cape Coral, Florida
Last edited by C5 Diag; May 26, 2025 at 08:33 PM.
Drifting
Joined: Apr 2016
Posts: 1,286
Likes: 610
From: DFW Texas
Your stated problem is a bit cryptic and an alternate interpretation could be as follows: You car starts easily most times when cold, but after the car is driven and warms up a hot start results in the starter straining to start the engine. If this is the case, your starter is being affected by the heat and is suffering from what is known as heat soak. This is not a problem with your battery rather you need to insulate your starter from excessive heat, especially if you have LT headers. There are heat shield or heat wrap solutions for the starter, but yours may also need to be replaced as it has been damaged from heat.
GD
GD
Team Owner
Joined: Mar 2002
Posts: 44,641
Likes: 1,827
From: Huntsville AL
Safety Car
Joined: Aug 2013
Posts: 4,427
Likes: 604
From: Minneapolis Mn
You likely have something in the car, not the battery that's the problem. Got a manual, are you putting it into reverse when shutting it off? Still have the On-Star fuse in the fuse-block? How about things like the lights on the mirror or glove box still on? You get the idea, there are many possibles here but you'll have to search them out.
Racer
Joined: May 2017
Posts: 406
Likes: 96
From: Seattle WA
These cars, or at least the C6Z are known to draw a lot of power from the battery even while off. That's why most people put their cars on a battery tender. Also I recommend an AGM battery.
Sounds like your issue is different though if it "drags" after driving, but you should get a tender anyway.
Sounds like your issue is different though if it "drags" after driving, but you should get a tender anyway.
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