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Thread: Biggest battery I can fit?

  1. #1
    Regular Member lee gsi's Avatar
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    Vehicle : Signum

    Trim : Design

    Engine : 1.9 CDTi

    Year : 2005

    Default Biggest battery I can fit?

    Any idea what the biggest battery is I can fit to my Signum CDTi?

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    Vehicle : Golf 7

    Trim : GTD

    Engine : 2.0 TDI 184PS

    Year : 2014

    Mileage : 40000

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    As big as the electrical load required and one which will not stress the alternator - obviously depending on the alternator rating (105A-hr?) so the largest battery the one which is closest to that amp-hour rating to be safe.

  3. #3
    Regular Member lee gsi's Avatar
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    Vehicle : Signum

    Trim : Design

    Engine : 1.9 CDTi

    Year : 2005

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    How can you stress the alternator.

    It will only give out its maximum output.

    Having a bigger battery will just store it for longer.

  4. #4
    Regular Member 2wheelstu's Avatar
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    I just replaced the battery on my 1.9cdti. Assuming that the battery housing is the same on your model. I put a Varta F18 silver on. Purchased from battery2u for £95 inc next day delivery. It has 85ah with an 800 cold crank rating. Makes a huge difference to my cold starting. The silver range is designed for vehicles with lots of equiptment and aftermarket sound systems. The dimensions of this battery are 315mm x 175mm x 175mm. Fits perfectly. Hope this helps

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    Regular Member 2wheelstu's Avatar
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    I just put a new high load battery on my 1.9cdti. Got a varta F18 silver for £95 including delivery from battery2u. 315mm x 175mm x 175mm. The varta silver range is designed for cars with lots of equipment and aftermarket sound systems. It is 85ah with 800 cold cranking. Hope this helps.

  6. #6
    Regular Member Tinks's Avatar
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    Vehicle : Vectra C Elegance


    Engine : 1800

    Year : 2003

    Mileage : Lots

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    Completely agree with Gaz, if the battery you install on the car is too high for the alternator it will cook the alternator - seen it so many times.

    The solution : if you want to power additional items like big audio system, etc then the correct way to go would be with a split charge system - not overly expensive and real simple to install and you can retain the standard unfried alternator and a happy standard battery powering just the car.

    Hope this info helps.

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    im struggling to believe you can overdraw on an alternator , it will only give out what its meant too at any given rpm surely ?? i have fitted bigger than needed batteries on several cars without any problems

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    Vehicle : Golf 7

    Trim : GTD

    Engine : 2.0 TDI 184PS

    Year : 2014

    Mileage : 40000

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    Quote Originally Posted by lee gsi View Post
    How can you stress the alternator.

    It will only give out its maximum output.

    Having a bigger battery will just store it for longer.
    never mind

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    Vehicle : Golf 7

    Trim : GTD

    Engine : 2.0 TDI 184PS

    Year : 2014

    Mileage : 40000

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    Quote Originally Posted by bembo449 View Post
    im struggling to believe you can overdraw on an alternator , it will only give out what its meant too at any given rpm surely ?? i have fitted bigger than needed batteries on several cars without any problems

    point taken

    But you can stress an alternator with excessive electrical load.

  10. #10
    Ex-Staff Full Member John LE's Avatar
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    Vehicle : Facelift Insignia/Corsa D

    Trim : LE/VXR

    Engine : 2.0 cdti/1.6 Turbo

    Year : 13/07

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    Nothing wrong with fitting a higher rated battery mate.

    I towed my caravan on the last Vec meaning it technically had 2 batteries and had no problems what so ever.

    Your not increasing the the load on the alternator as you are drawing the same amount of power as you did before.

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