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Thread: Jump Start & Charge from a Portable 12v Battery?

  1. #1
    118902
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    Jump Start & Charge from a Portable 12v Battery?

    1. store my R1100S in an underground garage with no electricity and try to ride once a month in the winter.
    2. keep a portable 12v battery with both clips and a cigarette lighter cord that fits into the accessory socket I had installed when I purchased the bike (Clips useless on this bike because battery is buried way inside bike).
    3. do NOT want to fry the electrics on this bike that has reliably carried me 50,000 miles since purchase, and closest dealer is an hour away.
    Q1. if battery looses enough juice so bike won't start, may I jump it from the portable, through the accessory receptacle with damaging bike?
    Q2. Will leaving the portable plugged into bike for a few hours a week help charge the battery?
    Q3. What is the approx. life of a stock BMW battery for this bike (on second one, first lasted 3 years).

  2. #2
    bmwmick
    Guest
    Quote Originally Posted by 118902 View Post
    Q1. if battery looses enough juice so bike won't start, may I jump it from the portable, through the accessory receptacle with damaging bike?
    No, That circuit is fused with a 7Amp fuse and it will blow if you attempt to jump start the bike using that circuit.
    Q2. Will leaving the portable plugged into bike for a few hours a week help charge the battery?Possibly but only if that 'spare' battery is fully charged and you do NOT attempt to start the engine while it's connected. The two batteries will equalize.
    Q3. What is the approx. life of a stock BMW battery for this bike (on second one, first lasted 3 years)
    One to three years is all I've ever got from a BMW battery. I would not buy another. .
    Mick

  3. #3
    Registered User kgadley01's Avatar
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    I got 5 yrs out of my last BMW Gel Battery. I replaced it last month with an Odyssey PC680.
    AKA SNAPGADGET
    Lifes too short to ride an ugly Motorcycle

  4. #4
    118902
    Guest
    Thank you !!!

  5. #5
    Like Mick said, don't try to start it with power on the accessory outlet.

    Here's a charging option though.
    Best if your car is parked beside the bike but would also work with the portable battery if it's big enough.

    Car battery >>> 100W inverter >>> Battery tender >>> Accessory outlet

    Leave it on overnight every other week.

    As a bonus, it might point out a deficiency in your car battery.
    Mike Marr
    1978 Yamaha XS750 (Needs rings), 1996 BMW R1100RS, 2004 Honda CRF230F

  6. #6
    Pepperfool GSAddict's Avatar
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    The safest place to jump start it is at the starter+ terminal and the starter body mounting bolt- with suitable sized alligator clips. Be extra careful.
    '
    Ufda happens..........

    Need your R11xx Hall sensor rewired? PM me.

  7. #7
    Kool Aid Dispenser! jimvonbaden's Avatar
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    Quote Originally Posted by GSAddict View Post
    The safest place to jump start it is at the starter+ terminal and the starter body mounting bolt- with suitable sized alligator clips. Be extra careful.
    Yup, I have done it that way several times. Easy access on the GS. On the RT you can do it pulling the seat and using a screwdriver to reach the positive post.

    Best way is to get the jump start post adapter and add it to your starter cover.

    Jim
    www.JVBProductions.com Now, all videos available via download or DVD, or USB for the Wethead.

  8. #8
    Pepperfool GSAddict's Avatar
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    Quote Originally Posted by JimVonBaden1 View Post
    Yup, I have done it that way several times. Easy access on the GS. On the RT you can do it pulling the seat and using a screwdriver to reach the positive post.

    Best way is to get the jump start post adapter and add it to your starter cover.

    Jim
    For those willing to spend the $ & time - you bet!
    '
    Ufda happens..........

    Need your R11xx Hall sensor rewired? PM me.

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