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Thread: Low battery - 6.5 - 8.5V

  1. #1
    Join Date
    Jun 2010
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    Central Coast NSW
    Posts
    1,782

    Low battery - 6.5 - 8.5V

    Hi all,

    This morning the D3 wouldn't start - it at first gave a low voltage warning then would just switch off when you turned the ignition on. I plugged in the IID Tool and it showed an at rest voltage of 8.5V and when you had the ignition on a voltage of 6.5V

    The battery is just under two years old (I can't find the bloody receipt! ) and shows no signs of damage. The car was last driven last Sunday, so it has sat still for less than 5 whole days. I have a Traxide SC80 installed, and when I last checked it on Sunday it was flashing to show it was over 85% charged.

    I have never seen it drop this low, and I was of the understanding that the SC80 isolated the batteries when voltage dropped below a certain level, giving me some security against this happening. I have seen people isolating the SC80 when storing the car for a while - Can someone please explain why?

    Also, can someone recommend a good battery charger - I have thought about getting one for a while now as Finn's battery will need to be topped up every now and then. I have anderson plugs at the back of the D3 which is my preferred charging method.

    Cheers

    Dan
    '08 D3 4.0 V6 :) - 265/65/R17 on X5 rims.
    FINN - '72 88" S3 - 2.286 petrol - yet to go on it's first adventure
    GONE '96 D1 300Tdi - 2" lift, 32" tyres, HD rear axles, lockers :(

  2. #2
    Join Date
    Jan 1970
    Location
    Logan
    Posts
    20,414
    Cold weather can affect batteries.
    If you put it on a multi-stage charger for several days the regular excitement caused by the charger should help to prevent sulphur build-up and keep it healthy. They like periods of excitement followed by rest periods.
    I have two Projecta chargers, which are fine, but any of the well-known multi-stage ones should do a good job.
    2009 Defender 110 2.4. ARB bulbar, Ironman winch, Safari snorkel, Steinbauer chip, AP HD clutch, Lightforce spots, larger tank, Off Road Systems drawer, Traxide 160 controller, Tekonsha brakes, Mulgo seat runners, Uniden UHF, Nuggetstuff seat corners, breathers, Polaris GPS.

  3. #3
    Join Date
    Jan 1970
    Location
    Logan
    Posts
    20,414
    BTW I have never done anything to isolate my SC80, but I have an 80 watt solar panel on the roof rack to keep the starting battery charged, so my experience may not be typical.
    2009 Defender 110 2.4. ARB bulbar, Ironman winch, Safari snorkel, Steinbauer chip, AP HD clutch, Lightforce spots, larger tank, Off Road Systems drawer, Traxide 160 controller, Tekonsha brakes, Mulgo seat runners, Uniden UHF, Nuggetstuff seat corners, breathers, Polaris GPS.

  4. #4
    Join Date
    Jan 2017
    Location
    Whitsundays
    Posts
    119
    If you have an sc80 Iím sure Tim from traxide would be happy to discuss with you direct. Perhaps your battery has just had a catastrophic collapse. And drained that low it will probably dodgy going forward and new one needed. Just replacing mine now so feel your pain.

  5. #5
    Join Date
    Jan 2015
    Location
    Sydney
    Posts
    771
    Switching it off is to stop it drawing power. Turning off the SC80 or using storage mode discussed in these threads:

    Battery failure #2 grrr

    Traxide isolator earth wire on/off switch

    David
    Everything is easy when someone else is doing it
    MY14 SDV6 SE Corris Grey
    Compomotive 18s : D697s : Traxide DBS : LLAMS : ARB compressor : IC-450N
    Rhino Platform : GOE compressor, Tx & front bash plates, deluxe sliders

  6. #6
    Join Date
    Jun 2013
    Location
    NSW Australia
    Posts
    208
    Quote Originally Posted by Disco-tastic View Post
    Hi all,

    This morning the D3 wouldn't start - it at first gave a low voltage warning then would just switch off when you turned the ignition on. I plugged in the IID Tool and it showed an at rest voltage of 8.5V and when you had the ignition on a voltage of 6.5V

    The battery is just under two years old (I can't find the bloody receipt! ) and shows no signs of damage. The car was last driven last Sunday, so it has sat still for less than 5 whole days. I have a Traxide SC80 installed, and when I last checked it on Sunday it was flashing to show it was over 85% charged.

    I have never seen it drop this low, and I was of the understanding that the SC80 isolated the batteries when voltage dropped below a certain level, giving me some security against this happening. I have seen people isolating the SC80 when storing the car for a while - Can someone please explain why?

    Also, can someone recommend a good battery charger - I have thought about getting one for a while now as Finn's battery will need to be topped up every now and then. I have anderson plugs at the back of the D3 which is my preferred charging method.

    Cheers

    Dan
    What brand is the battery, is it stamped on the terminals at all, is there a number or letter burnt into the top casing? If it is, you don't need a receipt, that's the date code, they will replace generally.
    If at first you do not succeed, maybe your just no good and should quit!

  7. #7
    Join Date
    Oct 2014
    Location
    Brisbane
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    3,396
    Quote Originally Posted by Disco-tastic View Post
    .... I was of the understanding that the SC80 isolated the batteries when voltage dropped below a certain level, giving me some security against this happening. I have seen people isolating the SC80 when storing the car for a while - Can someone please explain why?
    Dan, the isolator will separate the batteries but that won't stop a battery from dying.
    The isolator can only protect your cranking battery from external problems, like excessive drains from accessories or failure of the aux battery.
    As David mentioned, the disconnection of the isolator simply stops it from being an unnesscessary drain during times of inactivity.

    I'd say your battery is cactus at those very low voltages.

    Cheers,
    Scott
    D4 TDV6 MY14 with Llams, 18" Wheels & BFG KO2s, Traxide DBS, Drifta Drawers, Rhino Platform, APT Sliders & compressor plate & Mitch Hitch
    Link to my D4 Build Thread

    Ex '77 RRC 2 door. Long gone but not forgotten.

  8. #8
    Join Date
    Jun 2010
    Location
    Central Coast NSW
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    1,782
    Quote Originally Posted by josh.huber View Post
    What brand is the battery, is it stamped on the terminals at all, is there a number or letter burnt into the top casing? If it is, you don't need a receipt, that's the date code, they will replace generally.


    Is that the sort of thing you mean?
    '08 D3 4.0 V6 :) - 265/65/R17 on X5 rims.
    FINN - '72 88" S3 - 2.286 petrol - yet to go on it's first adventure
    GONE '96 D1 300Tdi - 2" lift, 32" tyres, HD rear axles, lockers :(

  9. #9
    Join Date
    Jun 2010
    Location
    Central Coast NSW
    Posts
    1,782
    Quote Originally Posted by LRD414 View Post
    Dan, the isolator will separate the batteries but that won't stop a battery from dying.
    The isolator can only protect your cranking battery from external problems, like excessive drains from accessories or failure of the aux battery.
    As David mentioned, the disconnection of the isolator simply stops it from being an unnesscessary drain during times of inactivity.

    I'd say your battery is cactus at those very low voltages.

    Cheers,
    Scott
    Yeah i fear its way past cactus. I just put a multimeter across it and measured 5.65V. The last battery i had died and it measured 10.5V so i have no idea what happened here.

    I will take it back to where i bought it from and see how i go with warranty. Its a century battery so I expected longer service from it!
    '08 D3 4.0 V6 :) - 265/65/R17 on X5 rims.
    FINN - '72 88" S3 - 2.286 petrol - yet to go on it's first adventure
    GONE '96 D1 300Tdi - 2" lift, 32" tyres, HD rear axles, lockers :(

  10. #10
    Join Date
    Jan 1970
    Location
    Queensland
    Posts
    6,834
    Hi Dan have measured the voltage on your auxiliary battery?

    If your cranking battery is still in your Disco, and loosing voltage like that, I suggest you check out your alternator.

    If the alternator has cooked a diode, while it will still work while the motor is running, it can flatten a cranking battery in a similar way to how yours is discharging, while the motor is off.

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