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Thread: Battery Voltage

  1. 8th January 2016, 05:34 PM #1
    Road Stone Guest

    Battery Voltage

    Hi Folks,


    I was just wondering what the correct battery voltage is when the car is not running. Read various threads which indicate mine may be a bit low.


    I have no running/starting issues at the moment. Car had a new battery fitted in October before shipment to here.


    Recorded on my Diagnostics device I have:


    12.1v after a run
    12.1v after car has sat for 5 days not used. But has been open and closed a couple of times.
    Put my SCA "smart charger" on it last night and this morning 12.3v.


    Can someone advise their experiences?


    As stated I have no issues at this point and battery is new.


    Cheers, Jerry
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  2. 8th January 2016, 05:40 PM #2
    Eevo's Avatar
    Eevo
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    simple answer

    12.1 is about 50%
    12.3 is about 75%
    12.6 is about 100%
    Current Cars:
    2013 E3 Maloo, 350kw
    2008 RRS, TDV8
    1995 VS Clubsport

    Previous Cars:
    2008 ML63, V8
    2002 VY SS Ute, 300kw
    2002 Disco 2, LS1 conversion
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  3. 8th January 2016, 07:00 PM #3
    Homestar's Avatar
    Homestar
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    Yeah, 12.6 to 12.7 is fully charged. 12.1 is quite low. What sort of voltage do you have while it's running? You should have around 13.8 to 14.0 on these.
    If you need to contact me please email homestarrunnerau@gmail.com - thanks - Gav.
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  4. 8th January 2016, 10:57 PM #4
    Road Stone Guest
    Many thanks for the replies.


    Okay, today when out for about an hours run, started the car a couple of times.


    After being home for a couple of hours the reading is 12.5 -12.6v.


    I started the car in the car port and it reads 13.5 to 13.7v.


    Is there anything I should read into this?


    Cheers, Jerry
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  5. 9th January 2016, 05:03 AM #5
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    Homestar
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    Charging system is fine - these vehicles do use power while sitting there doing nothing, and just unlocking them starts up systems that use more power, so I wouldn't be too concerned. If the battery does start to die, the car will start to throw fault codes during, or just after starting - things like EAS Fault or ABS fault. This is usually the first sign the battery is on the way out.
    If you need to contact me please email homestarrunnerau@gmail.com - thanks - Gav.
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  6. 9th January 2016, 05:54 PM #6
    Road Stone Guest
    Yes, the charging does appear to be doing its job and yes, there is lots of whirring and puffing when the car is unlocked!


    Carrying on with the observations, battery is down to 12.1-2v this morning, so it would suggest to me that my new battery is not holding the charge well.


    I don't have a drain, as it maintains 12.1v over many days.


    As stated I took it out yesterday after 4 days. 12.1v and indeed I got an EAS warning which cleared almost immediately.


    Next move is to ask the guys who put the battery in a question or two!


    Thank again.
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  7. 9th January 2016, 06:21 PM #7
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    its as if its dropped a cell
    Current Cars:
    2013 E3 Maloo, 350kw
    2008 RRS, TDV8
    1995 VS Clubsport

    Previous Cars:
    2008 ML63, V8
    2002 VY SS Ute, 300kw
    2002 Disco 2, LS1 conversion
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  8. 9th January 2016, 06:44 PM #8
    bee utey's Avatar
    bee utey
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    How about you compare the readout with an accurate volt meter? No sense panicking if the readings are wrong. It's like asking for a second opinion from a qualified health professional before diagnosing a prolapsed battery.
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  9. 9th January 2016, 07:16 PM #9
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    Eevo
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    Quote Originally Posted by bee utey View Post
    How about you compare the readout with an accurate volt meter? No sense panicking if the readings are wrong. It's like asking for a second opinion from a qualified health professional before diagnosing a prolapsed battery.
    good point.
    use a multi meter across the battery.
    Current Cars:
    2013 E3 Maloo, 350kw
    2008 RRS, TDV8
    1995 VS Clubsport

    Previous Cars:
    2008 ML63, V8
    2002 VY SS Ute, 300kw
    2002 Disco 2, LS1 conversion
    Reply With Quote Reply With Quote
  10. 10th January 2016, 04:04 PM #10
    Road Stone Guest
    Okay, understand that.


    But are you saying the reading from the Diagnostics is not accurate?


    Cheers, Jerry
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