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Thread: “Riddle me this Batman”

  1. #1
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    “Riddle me this Batman”

    When is a “good” battery, not a “good” battery?

    A quick re-cap. Two mornings camping on Moreton Island, even with a Traxide SC80 the cranking battery (wet lead acid) wouldn’t turn the engine over.

    Got home. Put on charge. 3hrs later 12.68v. 24hrs later 12.62v. Wouldn’ turn over. Checked charge after. 11.2v.

    So new battery in, old battery out. Old battery had been on charge. 13.1v. 5 days later still 13.1v. (A bit high for a wet lead acid battery?)

    Took to Battery World. Tested. Battery good. 720cca down from 770cca. 13.0 volts.
    “I don’t think it is good”
    ”Ok. Bring out the Durst” Same result.

    Back home. Put old battery back in. Turns over no problem. 24hrs later barely turns over once.
    10.66v after.???
    MY08 TDV6 D3 Zermatt Silver, B.A.S ECU Remap, ARB Bar, 12K Kingone Winch, 2x100Ah LiFePo4 Auxiliary Power, Safari Snorkel, Baja Rack Roof Rack, Brown Davis Aux. Tank, RWC, Front Runner Rear Ladder, Drifta Drawers, Doran TPMS, LLAMS, GAP IID BT.

  2. #2
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    Its a Land Rover thing................
    Discovery 1 4.6, true trac front and rear, superior engineering arms,old tourer now bush toy
    Discovery 4 3.0 HSE MY13 ECB Bull bar, winch, spot lights, aux fuel tank, Kaymar rear bar, duel wheel carriers, 18 tuff ant wheels 265/65/18 BFG KO2's for play

  3. #3
    Ean Austral Guest
    It's a battery thing ....


    Cheers Ean

  4. #4
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    To be honest 770CCA is not enough, our battery(same as the Factory) is 900CCA, old battery is dead, new battery isn't up to the task, also I would check your auxiliary battery also, failing that it could be your SC80 is faulty.

    I'm sure Drivesafe will be along soon to give you the answer you need, or PM or phone him really easy guy to deal will, be warned though he likes a chat
    Cheers Baz.

    2011 Discovery 4 SE 2.7L
    1990 Perentie FFR EX Aust Army
    1967 Series IIa 109 (Farm Truck)
    2007 BMW R1200GS
    1979 BMW R80/7
    1983 BMW R100TIC Ex ACT Police
    1994 Yamaha XT225 Serow

  5. #5
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    Quote Originally Posted by SeanC View Post
    When is a “good” battery, not a “good” battery?
    When it won't crank 1 day after being charged regardless of what battery tests say.
    2011 D4 3.0 SDV6
    1999 D2 V8, in heaven
    1984 RRC, in hell

  6. #6
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    6 years ago I purchased an $50k battery tester.
    It has been 100% correct on 2 occasions.
    The brand and model of the battery tester is "Landrover Discovery 3".
    I'm of the opinion you can navel-gaze battery theory until the cows come home - but one thing I know for sure is the car will definitely tell you the battery will just not do its job any longer. (and it has a huge task to provide energy for the systems in a modern car with "stuff-all tolerance" for low voltages)
    Fit a new battery - problem goes away for another few years.
    Matti
    A few Landies - current = 2009 D3 2.7 Auto with some rusty bits hanging off it.

  7. #7
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    Quote Originally Posted by matti4556 View Post
    6 years ago I purchased an $50k battery tester.
    It has been 100% correct on 2 occasions.
    The brand and model of the battery tester is "Landrover Discovery 3".
    I'm of the opinion you can navel-gaze battery theory until the cows come home - but one thing I know for sure is the car will definitely tell you the battery will just not do its job any longer. (and it has a huge task to provide energy for the systems in a modern car with "stuff-all tolerance" for low voltages)
    Fit a new battery - problem goes away for another few years.
    Matti
    Have an Odessey PC1350 in there now. Just interesting that the old battery could crank the motor without hesitation the barely turn it over the next day but sit for 5 day at 13.1volts.
    I just don’t like not knowing why. Must be the scientist in me.
    MY08 TDV6 D3 Zermatt Silver, B.A.S ECU Remap, ARB Bar, 12K Kingone Winch, 2x100Ah LiFePo4 Auxiliary Power, Safari Snorkel, Baja Rack Roof Rack, Brown Davis Aux. Tank, RWC, Front Runner Rear Ladder, Drifta Drawers, Doran TPMS, LLAMS, GAP IID BT.

  8. #8
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    Yeah I know where you are coming from Sean. I was like that until recently. I could tell you how to tune in your new VCR (remember them) because I would read the owners manuals back to front - all of them! I KNOW! = what a weirdo!? https://www.aulro.com/afvb/images/smilies/Smile.png but working in an appliance test laboratory did this to you - you knew exactly what factory made the magnetron for a particular model Sharp microwave oven but be stuffed if you could remember your wedding anniversary!
    These days, remembering the wedding anniversary seems much more important for me https://www.aulro.com/afvb/images/sm...mileBigEye.png

    But to theorize your battery issue in my "special" way - I would hazard a guess that the "crank one day and not the next" is related to internal resistance. It will read an ok-ish voltage with no load, but when push comes to shove it cant deliver more than once - sort of like when a pretty girl walks by - "suck the stomach in" to look good (battery terminal voltage), and hope to hell she doesn't hang about too long before you cramp up. Have a read of the terminal voltage when cranking.
    A few Landies - current = 2009 D3 2.7 Auto with some rusty bits hanging off it.

  9. #9
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    Quote Originally Posted by matti4556 View Post
    But to theorize your battery issue in my "special" way - I would hazard a guess that the "crank one day and not the next" is related to internal resistance. It will read an ok-ish voltage with no load, but when push comes to shove it cant deliver more than once - sort of like when a pretty girl walks by - "suck the stomach in" to look good (battery terminal voltage), and hope to hell she doesn't hang about too long before you cramp up. Have a read of the terminal voltage when cranking.
    Love the analogy.
    MY08 TDV6 D3 Zermatt Silver, B.A.S ECU Remap, ARB Bar, 12K Kingone Winch, 2x100Ah LiFePo4 Auxiliary Power, Safari Snorkel, Baja Rack Roof Rack, Brown Davis Aux. Tank, RWC, Front Runner Rear Ladder, Drifta Drawers, Doran TPMS, LLAMS, GAP IID BT.

  10. #10
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    Speaking of batteries, Supercharge Gold Plus MF88h 900CCA batteries are currently on special at AutoBahn for $223 bargain. Mines 5 years old and still last as long and still runs like new. Tempted to buy another just because they're so cheap! Don't like buying batteries online... Haven't had much luck with warranty in the past with other, more expensive ones.

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