Normal Battery Voltage at different states
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Cadillac STS Forum - 2005 through 2012 Discussion, Normal Battery Voltage at different states in Past Cadillac Vehicle Discussion; I think my battery may be on it's way out, it died after having the ACC on for <35 minutes. ...
  1. #1
    bass_sts is offline Cadillac Owners Member
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    Normal Battery Voltage at different states

    I think my battery may be on it's way out, it died after having the ACC on for <35 minutes. (not able to start).

    Before normal running was reading 14.2 V
    Now it sits between 13.2 - 13.8.

    I'll have it checked but I am curious about others.

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  3. #2
    next2pool is offline Cadillac Owners Connoisseur
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    Re: Normal Battery Voltage at different states

    Quote Originally Posted by bass_sts View Post
    I think my battery may be on it's way out, it died after having the ACC on for <35 minutes. (not able to start).

    Before normal running was reading 14.2 V
    Now it sits between 13.2 - 13.8.

    I'll have it checked but I am curious about others.
    It may be getting tired--you really need a "load" test to find out for sure since voltage is only part of the story. After sitting for a few hours a fully charged battery will be at 12.6 V. With the alternator charging, it can be anywhere from about 13.5V to 14.5V so that gets a bit confusing as well. 35 minutes on acc position sounds short unless you were cranking the stereo.

  4. #3
    z06bigbird is offline Cadillac Owners Connoisseur
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    Re: Normal Battery Voltage at different states

    14.2 in state of Texas.

    Can't remember what it was in state of PA or TN.

  5. #4
    turnerbend is offline Cadillac Owners Fanatic
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    Re: Normal Battery Voltage at different states

    Quote Originally Posted by z06bigbird View Post
    14.2 in state of Texas.

    Can't remember what it was in state of PA or TN.
    13.5-14.5 in the United States.

  6. #5
    bass_sts is offline Cadillac Owners Member
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    Re: Normal Battery Voltage at different states

    Helpfull, you guys are smart a**es but helpful

    Ended up having to get it replaced like I thought, harder to find the Interstate Batteries than anything else, ended up at a Pontiac Dealership, 203 Bucks, but it's running fine again.

    Thanks for the info

  7. #6
    Dougs06sts's Avatar
    Dougs06sts is offline Cadillac Owners Member
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    Re: Normal Battery Voltage at different states

    I've been having issues at startup and battery wouldn't start the car until the 3rd try tonight. Voltage at startup climbs from 14.6 to 15.1 then settling back to 14.5 after running 5-10 mins. Does this sound like a bad battery? I'm taking it to the dealer day after tomorrow and would like to know if anyone's run into this before. Appreciate any help you guys can provide.

    Thx.

  8. #7
    Aurora5000's Avatar
    Aurora5000 is offline Cadillac Owners Fanatic
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    Re: Normal Battery Voltage at different states

    As I found out last year with my wife's CTS, you cannot go to the local auto parts houses and buy an OTC battery for your CTS. The same holds true for the STS as I found out last year. The series of the battery is 101 for the STS. A dealer item only. They go for $178 and up depending on what dealer you talk to.

    The parts houses will not sell you any sort of a replacement or try to fit something in of comperable quality saying "The incorrect battery was not made for that car and cannot warranty it." They are scared to even try.

    I got in the yellow pages under "Batteries" and located a few businesses that stocked car batteries. I remember a place that my Dad used to buy Semi-truck batteries at. They looked it up in their books and came up with 101 as the replacement. They installed a battery of the same dimensions with the exception of the replacement battery being about 1/2 inch taller than GM DELCO coming out of the car. Had the same CCA as GM. Also the battery warehouse said, "It did not matter what car their battery went into, they would give the full warranty for it." they put in but it fit in with little problems. A tight fit but no problems. Even the hold down mount matched up on the replacement battery. Cost less than $70 with tax. It was the same on the CTS last year. I finally checked to see what the number was on the replacement battery. It is a 78-72. Same dimensions as Delco, just 1/2 inch taller. It works fine.

  9. #8
    next2pool is offline Cadillac Owners Connoisseur
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    Re: Normal Battery Voltage at different states

    Quote Originally Posted by Dougs06sts View Post
    I've been having issues at startup and battery wouldn't start the car until the 3rd try tonight. Voltage at startup climbs from 14.6 to 15.1 then settling back to 14.5 after running 5-10 mins. Does this sound like a bad battery? I'm taking it to the dealer day after tomorrow and would like to know if anyone's run into this before. Appreciate any help you guys can provide.

    Thx.
    The charging voltage doesn't indicate much other than your alternator is charging--those numbers are not unusual. Check it after sitting overnight with the key on but not running. It should be about 12.6. If it is 12.2 or less, it is probably bad.

  10. #9
    Dougs06sts's Avatar
    Dougs06sts is offline Cadillac Owners Member
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    Cool Re: Normal Battery Voltage at different states

    Just got back from the dealership service department and yep... Bad battery was determined after running the test on the alternator as well. The car has 47K miles, so they replaced it and took care of several other little things (that I wasn't even aware of) under warranty.

    They also updated the programming on the PCM which dramatically improved the auto's shift points. I'll post that in another thread where it's easy to find.

    Thanks for your help !

  11. #10
    bass_sts is offline Cadillac Owners Member
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    Re: Normal Battery Voltage at different states

    See... I have that shift problem I think.

    It has hard shifts between 4/5, downshifts as well, say cruising 45 and push on the gas (not real hard) it ends up as a rough down shift.

    urrg.. have asked the dealership and they say "shifting as designed" any thoughts.?

  12. #11
    Greg00coupe is offline Cadillac Owners Enthusiast
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    Re: Normal Battery Voltage at different states

    Yes there are auto parts stores who do handle Delco batteries and they have the exact battery for an STS for around $100. I've had exceptional service with Delco and am satisfied with their batteries.

  13. #12
    KARL DAHLEN is offline Cadillac Owners Fanatic
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    Cool Re: Normal Battery Voltage at different states

    Quote Originally Posted by next2pool View Post
    The charging voltage doesn't indicate much other than your alternator is charging--those numbers are not unusual. Check it after sitting overnight with the key on but not running. It should be about 12.6. If it is 12.2 or less, it is probably bad.
    I just checked my battery as you suggested and it read 11.9 volts after sitting for two days. My dealer has already told me it passed their tests, therefore they could not replace it under warranty. It has already failed to start the car once and the battery is only a little over two years old, assuming it was fresh when installed in my new STS. I am inclined to replace it with an Interstate MTP H3 which fits the STS and is highly rated. Firestone quoted me $135 plus change out the door. It may be worth it for the peace of mind. What do you all think?

  14. #13
    next2pool is offline Cadillac Owners Connoisseur
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    Re: Normal Battery Voltage at different states

    That is very low. However there's the chance that something is pulling it down, but given the way battery drains are normally shut down by the computer, I doubt it. If you want to know absolutely for sure and you have the luxury of doing it, I would disconnect it to make sure the battery is isolated, and try it again. One day should be enough. A battery is considered fully charged at 12.6 and fully drained at 12.2. That seems like a narrow range, but those are considered normal "operating" ranges. If you go below 12.2, it will start, but the life can be reduced by as much as 40-50% with just a couple of discharges.If you try this, the battery should still be at 12.6 after sitting one day or even 5 or 6 for that matter.

  15. #14
    doowap57 Guest

    Arrow Re: Normal Battery Voltage at different states

    Guys, I don't know the consequences of disconnecting the battery,
    So watch out for that.
    ALL batteries except Gels, and closed "USE" water.
    so we are talking about calcium/lead batteries,called
    maintenance free. because you don't have to water them
    (AS OFTEN AS REGULAR LEAD ACID), but they still use water.
    so remove any top(s) on the battery, to expose the cell openings
    and ONLY put distilled water, NOT tap water, so it costs $ 2.00 a gallon,
    it WILL extend the life of your battery. there is a internal ring in each
    cell that is the max fill point for water, and ALL should be the same height.
    Use a Mini-Mag light and Measuring cup , to control the water amount.
    it is a GOOD idea to either drive to charge, OR put a charger on it,
    say for more than 4 hours, a 2 to 4 amp charger is OK, You are NOT
    trying to charge a dead battery, but "EQUALIZE" cells, and let it boil,(Bubble)
    the bubbles move the electrolyte around enough to mix the NEW water on
    top and mix in with the acid.
    Warning, do NOT overfill any cell,If you do , you must remove the excess.
    This usually renews questionable batteries, and changes it's character
    totally.
    Have Fun, and of course, use eye protection, regular glasses are OK
    Wash Hands when done, replace caps, and wash down top of battery,
    with Coke, or baking soda solution,NONE to get into the battery, then fresh water.
    Next2pool is correct above 12.2 or 12 volts is acceptable, and full charge
    could be 13.8 to 14.5, but NEVER above 14.7 or above,AND anytime the
    engine is running, it should NEVER stay at 12 or 12.2, it must go up immediately.
    Maybe slowly, but on the upswing, depending on how much the battery is discharged,
    IT could take 30 minutes of normal driving ! Because your driving lights, A/C, radio etc are ON !
    For you real teckkies, 2.38 volts per cell is fully charged X 6 Cells =14.28, if can go higher, because
    of NOT all of that juice is going to the battery,Running lights,A/C radio, etc are also ON,
    so with the battery taking what it needs, the rest is going to feed the loads.
    The Cad uses a remote sense point which is probably the fuse box, which is a GREAT Idea,
    I have used that point for years on Yachts, to eliminate the lights going dim on idle,
    and going brighter on revs. They stay a constant brightness, this way.
    Mileage on the car, indicating the age of the alternator, and age of the battery, if important
    information, to help determine cause of low battery voltage, after a few days of sitting.
    Peace of Mind is worth EVERY penny !

    Good Luck !

  16. #15
    pgw85706 is offline Cadillac Owners Member
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    Re: Normal Battery Voltage at different states

    I've studied numerous threads in the forum about "dead battery, "won't start", etc. This is about our 2005 STS V6 which randomly won't crank, and since it is my wife's car I need to eliminate the unreliability. The car has 97k miles.

    On 3 occassions now it won't crank. Accessories are active, but it won't crank. In each case I have jumped it successfully to start it. Voltage reads 14.7 once started, but I have noticed that after say 30-45 minutes of driving, the voltage drops to 13.5, and even as low as 13.0. Advance Auto Parts tested the battery and it was within specs. The charging system was outputting to spec as well. The car still has the original battery.

    My first reaction is to replace the battery, it probably is likely near end of life. But since AAP showed it was good, I fear I would just be throwing money away. If I replace the battery, then AC Delco or Interstate seems to be the two preferred choices.

    Should I take it to the dealer and let them run diagnostics? Would you vote to replace the battery and then proceed?

    Thanks.

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