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Thread: Battery draining issue

  1. 24th August 2021, 03:36 PM #1
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    Battery draining issue

    I have an issue with dropping voltage on my cranking battery (hence the previous posts about alternatives). It's a Supercharge 810CCA connected to a 120Ah AGM deep cycle auxiliary via a Traxide SC80. Both batteries have an isolator switch, and have been wired up according to Traxide instructions. The auxiliary isolator switch is turned off.

    The cranking battery is losing voltage. There's nothing obvious drawing power. After charging it with a CTEK charger a couple of days ago, the supplier said it tested fine (no dropped cells or anything else of interest). It's dropped from 12.81 last night to 12.69 this afternoon. I'll isolate it with the switch and check again tomorrow.

    Any suggestions what might be the cause?
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  2. 24th August 2021, 04:02 PM #2
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    probably something electrical.

    which model vehicle,
    Dave

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  3. 25th August 2021, 05:37 AM #3
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    1995 Defender 130. You know the one
    Quote Originally Posted by Blknight.aus View Post
    probably something electrical.

    which model vehicle,
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  4. 25th August 2021, 05:48 AM #4
    AK83
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    I'm no battery expert, but dropping to 12.69v from 12.8(whatever) would seem perfectly normal to me in that time frame.

    I thought 100% SoC is about the 12.7v(maybe even 12.6) level, and most batteries in very good condition will be resting in the 12.5v point.

    Colder climates affect this, but as you are up that way, those values should be fair enough approximations.
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  5. 25th August 2021, 06:58 AM #5
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    Hi Ranga, as Arthur replied, having a battery settle to 12.69v over a cold night is not bad.

    I would be very happy with that reading.

    For Land Rover Specific Dual Battery Systems and Headlight Wiring Upgrade Kits,
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  6. 25th August 2021, 04:39 PM #6
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    In the last 24 hours it's dropped from 12.69V to 12.57V - is it normal to continuously drop ~0.1V per day?
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  7. 26th August 2021, 12:45 AM #7
    johnp38
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    Quote Originally Posted by Ranga View Post
    In the last 24 hours it's dropped from 12.69V to 12.57V - is it normal to continuously drop ~0.1V per day?
    Just went outside and checked mine it is 12.69, will hopefully remember to check again b4 I start it.
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  8. 26th August 2021, 05:07 PM #8
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    Dropped another 0.11V today with no use. Surely that can't be right?
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  9. 26th August 2021, 05:44 PM #9
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    Quote Originally Posted by Ranga View Post
    Dropped another 0.11V today with no use. Surely that can't be right?
    Drive it around the block….that’ll fix the daily drop Battery draining issue
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  10. 26th August 2021, 05:51 PM #10
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    Quote Originally Posted by W&KO View Post
    Drive it around the block….that’ll fix the daily drop Battery draining issue
    Probably use more volts starting it than what I would get back
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