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Thread: My SDV 8 has a large 2nd Battery Standard

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    My SDV 8 has a large 2nd Battery Standard

    I had not looked until today but was pleasantly surprised to find a large 2nd Battery.

    My thoughts are I will upgrade this to the biggest battery that I can fit Lipo 4 will be my aim. My research to date indicated a very small battery or none at all. Seems the Australian versions of the SDV8 come with the large battery.
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    Quote Originally Posted by Bails View Post
    I had not looked until today but was pleasantly surprised to find a large 2nd Battery.

    My thoughts are I will upgrade this to the biggest battery that I can fit Lipo 4 will be my aim. My research to date indicated a very small battery or none at all. Seems the Australian versions of the SDV8 come with the large battery.
    What are you hoping to do with it? Disconnecting that will disable the "Stop/Start" function which would be a plus.
    Cheers,

    Sean

    “Only two things are infinite, the universe and human stupidity, and I'm not sure about the former.” - Albert Einstein

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    Quote Originally Posted by SBD4 View Post
    What are you hoping to do with it? Disconnecting that will disable the "Stop/Start" function which would be a plus.
    Size is 10 X 6.5 X 8 inches L X W X H , which means I should be able to find a decent LIPO 4 battery to put in there to run my accessories. I would be interested to know why such a large battery , from my research there seems to either a very small battery or just a capacitor.

    I am well pleased to see this setup, I am hoping it will just be a swap out no need for a DC to DC charger. Yes it would be good to get rid of the stop start function but that isn't so much an issue as I turn off all the time.
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    Quote Originally Posted by Bails View Post
    Size is 10 X 6.5 X 8 inches L X W X H , which means I should be able to find a decent LIPO 4 battery to put in there to run my accessories. I would be interested to know why such a large battery , from my research there seems to either a very small battery or just a capacitor.

    I am well pleased to see this setup, I am hoping it will just be a swap out no need for a DC to DC charger.
    That's what I have seen also. Mid you I have never bothered to check what is installed in mine. What year is yours?

    Quote Originally Posted by Bails View Post
    Yes it would be good to get rid of the stop start function but that isn't so much an issue as I turn off all the time.

    Yep, 1st button that gets pressed after the car is started is the stop/start button.
    Cheers,

    Sean

    “Only two things are infinite, the universe and human stupidity, and I'm not sure about the former.” - Albert Einstein

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    Quote Originally Posted by SBD4 View Post
    What are you hoping to do with it? Disconnecting that will disable the "Stop/Start" function which would be a plus.
    I understand that heated seats will stop working too.
    MY12 RRV 4.4 TDV8 AB, +LLAMS, +e-diff, +ACC stop/go. Produce LLAMS for LR/RR, Jeep GC/Dodge Ram
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    My wants are different, I am after a second battery that will run my fridge and Cel Fi and not switch the outlets off when the ignition is off.

    It looks like I will have plenty of space to put up to 100 amp hour Lipo 4 battery in. I now have to check if the standard electrical system will charge the Lipo4 OK, which I am thinking it will.

    If this all works it will be a very simple upgrade ,

    I will be towing a van so I may also want the ability to have the second battery connected to the van which will have it's own solar and batter source.

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    from the 2014 WSM:
    The dual battery system used on TDV8 4.4L Diesel in all markets and TDV6 3.0L diesel in cold climate markets with
    or without stop/start system, differs from the dual battery system used on vehicles with the all markets stop/start
    system. The dual battery system uses the auxiliary battery which is switched in parallel with the primary battery if
    the ambient temperature falls below a certain threshold, or the state of charge of the primary battery falls below a
    certain level. The function of the auxiliary battery is to assist the primary battery in cranking the car at a suitable
    speed to provide a start.
    In addition the dual battery system in TDV8 4.4L Diesel isolates all electrical components and systems sensitive to
    low supply voltage from the primary battery while an engine start is in progress and supplies them from the auxiliary
    battery.
    Gone - RRS SE SDV6 with Dynamic MY15.5 Yulong White, with LLAMS

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    Quote Originally Posted by Gregz View Post
    from the 2014 WSM:
    The dual battery system used on TDV8 4.4L Diesel in all markets and TDV6 3.0L diesel in cold climate markets with
    or without stop/start system, differs from the dual battery system used on vehicles with the all markets stop/start
    system. The dual battery system uses the auxiliary battery which is switched in parallel with the primary battery if
    the ambient temperature falls below a certain threshold, or the state of charge of the primary battery falls below a
    certain level. The function of the auxiliary battery is to assist the primary battery in cranking the car at a suitable
    speed to provide a start.
    In addition the dual battery system in TDV8 4.4L Diesel isolates all electrical components and systems sensitive to
    low supply voltage from the primary battery while an engine start is in progress and supplies them from the auxiliary
    battery.
    It seems the only time both batteries are in parallel is in cold conditions. This may be a problem as itech say their batteries should not be connected to batteries with different chemical structure. I aim to keep investigating but with my limited knowledge it seems I may be able to set up as desired.

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    Hi Bails, you can not connect lithium and lead acid batteries together because the lithium battery will have a constant settled voltage of around 13.2v over most of its discharge cycle.

    Whereas a lead acid battery reduces voltage from around 12.7v for a fully charged battery down to around 12.1v for a lead acid battery at about 70% discharged in a STOP/START and a variable voltage operating system. Which is how your vehicle works.

    The lithium battery will hold the voltage high and your BMS will not see a need to run your alternator at a high enough voltage to charge your batteries.

    So you could suddenly find you have two flat batteries, when the lithium is finally discharged enough to cause a voltage drop in the lithium battery.

    You need to use a DC/DC device to charge the lithium battery.

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