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Thread: Battery disconnect switch

  1. #1
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    Battery disconnect switch

    Hi all,

    I'm planning a camping trip away in my new defender and I'm concerned about the possibility of a flat battery from the doors being constantly opened and closed. I'll be going with a group of people that may have access to the vehicle from time to time and I don't want to be on the constant look out on how the car is being accessed and worrying about battery drain.

    To solve this, I'm wondering whether its possible or if anyone has installed a battery disconnect switch on the negative terminal of the battery which can be turned off when the car is parked and not being driven. If the vehicle needs to be moved, the switch can be turned on and the car started.

    I know these cars are heavy on electronics and battery use, so thought I'd check before installing anything.

    Thinking about a battery disconnect switch something like this:

    Ampper Top Post Battery Disconnect Switch, 12-48 V Battery Power Cut Master Switch Disconnect Isolator for Car, Vehicle, RV and Boat (Negative, On/Off) : Amazon.com.au

    Thanks in advance for any advice.
    MY16 D4 Fuji White SDV6, LLAMS, Rhino Pionner rack.

  2. #2
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    I just keep a door unlatched and let the car go to sleep then further opening doesn't wake it up.
    The rear door also doesn't turn on the Pivi screen - not sure about other electronics tho.
    If you want to disconnect the battery it's a 10mm socket and easy access under the driver's seat. You might struggle to find room to put that disconnect switch in and replace the battery cover.
    _________________________
    1996 D1 V8 - gone
    2002 D2 Td5 ES- gone but still running elsewhere
    2013 D4 SDV6 HSE - gone
    2023 Defender 110SE D300

  3. #3
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    Quote Originally Posted by jwb View Post
    I just keep a door unlatched and let the car go to sleep then further opening doesn't wake it up.
    The rear door also doesn't turn on the Pivi screen - not sure about other electronics tho.
    If you want to disconnect the battery it's a 10mm socket and easy access under the driver's seat. You might struggle to find room to put that disconnect switch in and replace the battery cover.
    Thanks jwb.

    I know about the rear door and plan to use that as much as possible.

    When you leave a door unlatched (say the drivers door), does opening any of the other 3 doors wake the system up or does the system still stay asleep?
    MY16 D4 Fuji White SDV6, LLAMS, Rhino Pionner rack.

  4. #4
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    Not sure a battery disconnect is the way to go because continually disconnecting and reconnecting the battery in a new defender "may" cause unforeseen problems with the vehicles computers.

    I would do a lot me research first.

  5. #5
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    Last year Andrew St Pierre White did a 15 min video on "Why is Defender such a poor choice for Adventure". He had some interesting things to say, but the comments section had some good fixes to his 'issues', especially about the battery drain. You might get some ideas to help you in the comments.
    Life is just a series of obstacles preventing you from taking a nap.

  6. #6
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    Quote Originally Posted by cripesamighty View Post
    Last year Andrew St Pierre White did a 15 min video on "Why is Defender such a poor choice for Adventure". He had some interesting things to say, but the comments section had some good fixes to his 'issues', especially about the battery drain. You might get some ideas to help you in the comments.
    He has a habit of fact free rants about the L663 for some reason e.g. losing an ABS sensor disables the vehicle and a flat battery requires a flatbed tow - both comprehensively debunked.

    Don't stress about the battery drain just enjoy your camping and have a recovery solution if needed e.g. jumper cables, a jumpstart pack or the like. Or do a simulation in your driveway?
    _________________________
    1996 D1 V8 - gone
    2002 D2 Td5 ES- gone but still running elsewhere
    2013 D4 SDV6 HSE - gone
    2023 Defender 110SE D300

  7. #7
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    Yes, hence 'issues' was in inverted comma's and check the comments instead! I have had a couple of conversations with him via email and in person at the Perth 4WD show and his knowledge of more modern Land Rovers is a little patchy. He nearly fell over when I told him my D3 had over 550,000km on the clock and was on its original engine and gearbox.
    Life is just a series of obstacles preventing you from taking a nap.

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