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Thread: Flat Battery...

  1. #1
    Regular Member n_hudson's Avatar
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    Default Flat Battery...

    ...WHY DO I KEEP GETTING A FLAT BATTERY!!!

    Every 2 weeks or so, I end up with a totally flat battery. I know that nothing is left on, not the radio, not the lights... nadda' nothing!

    I drive over 100 miles most days, surely that should keep the battery charged up?

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    Regular Member scottyd's Avatar
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    maybe a dodgy eath contact between alt and battery

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    Regular Member Hs2300's Avatar
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    Sounds like a discharge on the vehicle or the battery is knackered. Check for a discharge first by putting an AMP meter in series between the -ve battery pole and the earth lead terminal make sure everything is off including interior lights and under bonnet llight if you have one, if there is a discharge the meter will give a reading. Anything over 1 amp is ecessive. you will see some discharge due to natural drain and things that have a memory ie radios etc.

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    [Ex]Admin Duncan's Avatar
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    It could simply be a knackered battery and not able to keep, or even have in the first instance, a full charge. You need to get a proper test on it to see what's what.

    If the battery is iffy then simply the very cold ambient temp can make it's performance drop to below what it needs to start the car.

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    Regular Member 67688c's Avatar
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    Assuming the battery is okay and can hold its charge, heavy drain of the battery when everything is off is typical of a leaky diode on the alternator. You used to be able to buy replacement diode packs and fit them yourself, but I'm unsure if you can still do that these days.

    As the other posted stated, put a meter in series with the battery, switched to amperage ranges of course, (10 or 20amp range) and make sure everything is powered off first of course otherwise you may pop the meter. If it seems to be drawing a few amps try disconnecting the plug from the alternator, and if it drops significantly you definately have a faulty diode, in which case a repair or swap of the alternator should fix it.

    More than likely the battery, especially if its been on the car a while. This sort of weather will put the final nails in a slightly iffy battery, even though it seemed good throughout the warmer months.
    Last edited by 67688c; 6th December 2008 at 19:55.

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    East Scotland Regional Organiser signumboy's Avatar
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    If its any consolation i had to change my battery after 2 years i had only done about 16k, and by this time dealers had went out of business, place where i bought new battery told me that Vauxhall were notorious for buying huge amounts of batteries and storing them ...so technically speaking your battery could be a year or two old before it ever goes on the car or worse if they dont get their stock rotation in order

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    Regular Member 67688c's Avatar
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    Its demise after 2 years is not brilliant, most decent batteries should last 3 years at least, but AYS they could be getting on a bit before VX fit them.
    On the subject of batteries... are the VX batteries thats on the later facelift vecs sealed or do they have to be topped up occasionally. Shall have to check when its not so cold..lol
    Last edited by 67688c; 6th December 2008 at 20:34.

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    East Scotland Regional Organiser signumboy's Avatar
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    think all batteries are non serviceable now days i know the one i had and also the replacement were sealed units

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    I know Halfords is a dirty word, but they can test if your battery can hold charge, and they test them for free

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    East Scotland Regional Organiser signumboy's Avatar
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    worth a try but i think once your battery does this ..fraid the end is near

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