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Thread: Grounding a car battery

  1. #1
    Regular Member Merick's Avatar
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    Default Grounding a car battery

    Evening,

    I've got an old car battery that i want to use to charge a model helicopter, what would be the best thing to ground it to? The only thing i can find is a pair of ladders!!

    Does it even need grounding or can i just hook the ground of the charger to the ground terminal of the battery?

    Cheers.

    Mark

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    On a Sabbatical VauxVeteran's Avatar
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    Best check the voltages 1st, you could ground it to the car engine, as Vx tells you to do this when jumping a flat battery.

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    Regular Member Maddog1974's Avatar
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    You can just put the negative of the charger to the battery that will be no problem at all!!

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    Regular Member Merick's Avatar
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    Just to clarify.. the old battery isn't connected to a car.. it's from an old car and it's sat in the shed.. my nephew has a model helicopter that came with a ciggy lighter charger and no mains charger but i don't want to keep starting the car up to charge his battery for him.. i wondered how i'd go about using the old battery to charge the helicopter instead...

    Does the same apply, just stick the charger on the battery terminals and don't bother grounding the battery?

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    Regular Member Maddog1974's Avatar
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    Default

    Quote Originally Posted by Merick View Post
    Does the same apply, just stick the charger on the battery terminals and don't bother grounding the battery?
    That will be fine

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    Regular Member Ste's Avatar
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    Don't understand why you want or need to ground the battery for? It's only 12 V DC,

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    Default

    firstly,if your spare battery has been left flat over winter,there is a very good chance that it wont take a charge anyway if that is the case then throw it away,
    secondly the "ciggy" charger that came with the model helicopter is meant to charge a model helicopter and not a car battery,i hope you havent tried to charge the car battery with this cos you will damage/cook
    it, use a proper car charger for the car battery

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    Regular Member Neil's Avatar
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    Why not get one of these - then you won't need a car battery at all

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    Regular Member Merick's Avatar
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    Default

    I'm trying to charge the helicopter without having to keep starting the car up. Not charge the battery with the charger!! lol

    I wasn't sure if it needed grounding or not hence the question, now i know it doesn't need grounding.. i'll use it.

    The battery was full when i took it out, i swapped it thinking it was lacking power as the whole dash dimmed far too much when i turned the stereo on but a new battery did the same thing. Whether the old battery has held it's charge or not.. only one way to find out!

    I bought that exact device from maplins in warrington on Saturday but it's died already.. only used it once! lol Taking it back when i get the chance.

    Thanks all.

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