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Discussion Starter · #1 ·
My 2012 CTS Still has the original battery (I bought new in 2012). It seems fine, but I am concerned about the winter. It is always garaged, and I have just 6,600 miles on it. Cream puff! Anyway, on start up it reads 11+ - 12 and quickly jumps up to 14.8, where it remains. Today it jumped to 15 and stayed around 14.9.
Should I go ahead and get a new battery and if so, what kind?
I dont want to get stuck with a dead battery and it sure has treated me well since 2012. Thanks for any advice.
Cynthia Nardin (senior citizen!) PS: I was always a vet owner, but arthritis forced me to get a more confy car !
 

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My 2012 CTS Still has the original battery (I bought new in 2012). It seems fine, but I am concerned about the winter. It is always garaged, and I have just 6,600 miles on it. Cream puff! Anyway, on start up it reads 11+ - 12 and quickly jumps up to 14.8, where it remains. Today it jumped to 15 and stayed around 14.9.
Should I go ahead and get a new battery and if so, what kind?
I dont want to get stuck with a dead battery and it sure has treated me well since 2012. Thanks for any advice.
Cynthia Nardin (senior citizen!) PS: I was always a vet owner, but arthritis forced me to get a more confy car !
You're wringing the life out it. Bravo Zulu
 

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Discussion Starter · #5 ·
Only 6,600 miles and it’s winter driven? Surely you have another car to drive. Keep a tender on the battery and you’ll be fine.
Hi Mystical!
Yup, just 6,690 miles on her. Always garaged. Never out in the rain or snow! I'm 78 and dont drive too much. Had the (original) battery cked and mechanic said fine! 12.5. I was just concerned as it alway ran around 14.8 and recently runs at 15.
I was always vette owner.... Miss the sound of that engine.... but arthritis and age forced me to go for more comfort.
Thanks for the feedback!
Cindy
 

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The voltage jumps around quite a bit on these cars.
I watched mine one morning & was surprised how much it varies.

I just replaced the battery in my '12 last year.. I was amazed it lasted this long.

The unfortunate part was it died suddenly.
It was fine 1 day & the next morning it cranked a little slower than usual.
At lunch it wouldn't start.

With winter getting close, cut your losses & get a new one... it beats getting stranded somewhere.

I cannot recommend a brand. I buy from Napa because of convenience & the discount I get.
They seem to last the typical 5-7 years. The climate you live in also has effect on battery life.
too hot & too cold all take their toll. If you keep the car stored & always on a tender, they will typically last way longer than the warranty period. Let it go dead a few times & it drastically shortens the life.
 

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The alternator is pwm with a varying duty cycle depending on load. It’s not uncommon to see 12-13 volts in certain conditions.

There is actually a table for this in hptuners that allows you to command 100%dc vs stock numbers in the 90s. I believe this is another table referencing fuel flow to determine DC. Meaning when you hit wot, the alternator output is increased as voltage load is increased.
 

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Discussion Starter · #9 ·
The voltage jumps around quite a bit on these cars.
I watched mine one morning & was surprised how much it varies.

I just replaced the battery in my '12 last year.. I was amazed it lasted this long.

The unfortunate part was it died suddenly.
It was fine 1 day & the next morning it cranked a little slower than usual.
At lunch it wouldn't start.

With winter getting close, cut your losses & get a new one... it beats getting stranded somewhere.

I cannot recommend a brand. I buy from Napa because of convenience & the discount I get.
They seem to last the typical 5-7 years. The climate you live in also has effect on battery life.
too hot & too cold all take their toll. If you keep the car stored & always on a tender, they will typically last way longer than the warranty period. Let it go dead a few times & it drastically shortens the life.
The voltage jumps around quite a bit on these cars.
I watched mine one morning & was surprised how much it varies.

I just replaced the battery in my '12 last year.. I was amazed it lasted this long.

The unfortunate part was it died suddenly.
It was fine 1 day & the next morning it cranked a little slower than usual.
At lunch it wouldn't start.

With winter getting close, cut your losses & get a new one... it beats getting stranded somewhere.

I cannot recommend a brand. I buy from Napa because of convenience & the discount I get.
They seem to last the typical 5-7 years. The climate you live in also has effect on battery life.
too hot & too cold all take their toll. If you keep the car stored & always on a tender, they will typically last way longer than the warranty period. Let it go dead a few times & it drastically shortens the life.
Thank you so much for taking the time to respond re my battery. Your info was helpful. The moment my battery sounds/takes an extra whirr to start I will be going to have it changed. Indeed, I hope that it is not a situation that it is dead on the spot, I was looking into the Interstate battery that runs $299. 48 mo. Cant recall the model, as I have the paperwork in the car. I think "Z". Thanks again. Cindy
 
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