Flat battery

Discussion in 'Tech/Mech General' started by Mike B, Jan 24, 2014.

  1. Mike B

    Mike B Funster

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    Went out this morning to give the MH its monthly run and found the battery was completely flat. Voltage measurement across the disconnected battery terminals 0.8v, checked the multimeter against a known good battery and it checked OK.

    Measured the resistance across the battery leads, dead short, so the question is, what could be in circuit with the ignition switched off? :Doh:

    Merc Autotrail scout 2002 - sprinter
     
    Last edited: Jan 24, 2014
  2. MikeD

    MikeD Funster

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    A light on maybe?

    I have no expertise but sounds like a light is on somewhere? :thumb::thumb:
     
  3. icantremember

    icantremember Funster

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    That is DEAD and will probably not be retrievable.

    Probably Dawn left something switched on.:Doh:

    There are many things that help to drain your batteries such as alarms, clock, radio.
     
    Last edited: Jan 24, 2014
  4. gozomike

    gozomike Funster Life Member Life Member

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    Hi. I agree with the comments Brian has made above regarding the battery state and possible items causing a drain on it. I would connect a good battery with an ammeter in circuit and then see what drain there is and track it from there.

    Mike
     
  5. Dawn B

    Dawn B Funster

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    Not everything is my fault :cry:
    Besides I just tried to use the hoover without plugging it in - I don't 'do' electrics
     
    Last edited: Jan 24, 2014
  6. rikfos

    rikfos Funster

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    Maybe the alarm or immobiliser has run the battery down.
    Have the battery checked.
    I have a small solar panel that fits on to the windscreen and this plugs in to a live 12v socket
    and costs about £9, this tops up the vehicle battery.
     
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  7. icantremember

    icantremember Funster

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    Just most things then:Wink:
     
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  8. gozomike

    gozomike Funster Life Member Life Member

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    It could just be a faulty battery.


    A couple of weeks ago a friend came out to Gozo, he had used his truck for a couple of days and then again the next morning. He went back an hour or so later and it would not start. I went down with my jump leads, it would not start. I tried running mine with the leads connected for a while and the hand throttle giving a fast tickover – still no go (both vehicles are Toyota Hilux pickups) . The battery volts were reading around 10. We tried to charge the battery on the bench for at least 2 hours and it would not take anything so we took it back to the garage which had supplied it. He checked it and just gave us a new one.:thumb: I recon it was around 18 months old.



    It is not common for a battery to fail like this but I have known it before.
     
  9. Mike B

    Mike B Funster

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    Fitted another battery and found DAWN had left the radio on (or someone other than me had). :Blush: those dogs have got a lot to answer for.

    Unlike a normal vehicle, when you turn the ignition off the radio is still in circuit.

    One new battery coming up.

    Thanks for all your help.
     
  10. Dawn B

    Dawn B Funster

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    I knew there was someone else :cry:
     
  11. Heyupluv

    Heyupluv Read Only Funster

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    I would say it is the immobiliser..and anything else unknown that may be running in the backgrond..this use to happen on my last Fiat 130 multijet:Doh:
     
  12. Serendipitous

    Serendipitous Funster

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    Look on the bright side. Nothing wrong with the MHF. Result.:thumb:

    Reasonable charger available from lidl at the moment that can be used to recover over discharged batteries (maybe)

    Had an issue with a solar panel lead that took a bit of tracking down. Couldn't understand why the batteries went flat with a panel fitted whilst in winter storage. Found a very unhealthy plug and socket that was the cause.

    Cheers:Smile:
     
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