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Thread: Battery isolater switches

  1. #1
    Join Date
    7th January 2019 - 17:58
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    R1150GS
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    Fernhill
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    7

    Battery isolater switches

    I've recently purchased a late 90s BMW R1150 GS. Great bike - always wanted one and finally got one.

    One of my first jobs is to replace the battery. I'd love to get an fancy new lithium battery like an Ultrabatt but they're stupidly expensive - so I've ordered a Motobatt AGM to replace the Yuasa 51913 open-cell that was in the bike.

    I'm under no illusions about the quality of the Motobatt but I'd like it to last as long as possible. Normally I'd connect/disconnect the terminals if I knew I wouldn't be riding for a few weeks or longer, but that's a hassle on the R1150 GS because the battery terminals are under the fuel tank. So I'm thinking about installing a discrete battery isolater switch like you see on trucks & buses.

    Will isolating the battery cause any problems to the bike? The service manual says that the onboard Bosch/Motronic engine management module will lose its memory when you disconnect the power (apparently it tweaks the operating parameters as it "learns" from the engine) but I can't find an information about what this will mean in practice.

    Any advice or feedback would be appreciated. Please tell me if I'm about to do something dumb.

  2. #2
    Join Date
    9th May 2008 - 21:23
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    A little yellow one
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    Northern Waikato
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    Just use a battery tender, such as Oxford Oximiser.
    If the words I say offend you, imagine the ones I keep to myself...

  3. #3
    Join Date
    7th January 2019 - 17:58
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    R1150GS
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    Fernhill
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    7
    Quote Originally Posted by caspernz View Post
    Just use a battery tender, such as Oxford Oximiser.
    That would be the logical solution, but the bike is being stored in a shed that doesn't have power.

  4. #4
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    4th October 2008 - 16:35
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    Wellington
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  5. #5
    Join Date
    7th January 2019 - 17:58
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    Quote Originally Posted by BMWST? View Post
    these fellows may help
    Cheers. 👍🏻

  6. #6
    Join Date
    3rd February 2004 - 08:11
    Bike
    1982 Suzuki GS1100GK, 2008 KLR650
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    or one of these? does the shed have a window? https://www.jaycar.co.nz/12v-1-5w-so...arger/p/MB3504
    it's not a bad thing till you throw a KLR into the mix.
    those cheap ass bitches can do anything with ductape.
    (PostalDave on ADVrider)

  7. #7
    Join Date
    22nd July 2005 - 00:27
    Bike
    77 XL250
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    I had a solar trickle charger on my ride-on mower for years. It worked brilliantly considering it was left unused for months over Winter.
    The best way to forget all your troubles is to wear tight underpants.

  8. #8
    Join Date
    9th May 2008 - 21:23
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    Northern Waikato
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    Quote Originally Posted by peanut View Post
    That would be the logical solution, but the bike is being stored in a shed that doesn't have power.
    Bugger, the solar option will work though.

    Have used this type of switch, might suit your application. https://www.jaycar.co.nz/15a-spst-ma...witch/p/ST0574
    If the words I say offend you, imagine the ones I keep to myself...

  9. #9
    Join Date
    7th January 2019 - 17:58
    Bike
    R1150GS
    Location
    Fernhill
    Posts
    7
    Those solar trickle chargers look perfect! I'm going to get one and put it on the roof of the shed.

    Cheers guys. I appreciate your help with this.

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