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Thread: Battery tender use with 2018 C650GT -- some questions

  1. #1

    Battery tender use with 2018 C650GT -- some questions

    I assume the canbus system is alive and well on the newest C650GTs. I don't get my scooter till this Friday so I don't have a rider's manual yet. Is there a port on the scooter for hooking up a canbus-compliant battery tender? Is the battery hard to get to? Because I may want to bypass the canbus system and attach a regular pigtail directly to the battery terminals. I did this with my 2018 R9T so that I can use any run-of-the-mill battery tender.
    2000 BMW K1200RS
    2004 BMW R1100S
    2005 BMW K1200S
    2016 BMW F800GT
    2018 BMW R9T Pure
    2018 BMW C650GT

  2. #2
    The dealership just called me and said that they hooked up an SAE pigtail to the battery and brought the connector end out just under the fairing. They did this for free, without me asking them to. They said I will be pleased to see how they did it. This is great news -- don't need a canbus-capable tender now. IronHorse M/C in Tucson is the best!
    2000 BMW K1200RS
    2004 BMW R1100S
    2005 BMW K1200S
    2016 BMW F800GT
    2018 BMW R9T Pure
    2018 BMW C650GT

  3. #3
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    That's good that they did. On newer scooters the port in left "glovebox" (pocket) is actually a car "cigarette" style one. It's good for charging your phone (with a simple usb adapter) but that's about it. After messing with it for a while I wired the pigtail directly to the battery. I also made my own SAE to BMW style adapter from bunch of electrical parts laying around so I could use BMW charger. Obviously, you wouldn't need to do so for any other batter charger.

  4. #4
    Quote Originally Posted by Miro View Post
    That's good that they did. On newer scooters the port in left "glovebox" (pocket) is actually a car "cigarette" style one. It's good for charging your phone (with a simple usb adapter) but that's about it. After messing with it for a while I wired the pigtail directly to the battery. I also made my own SAE to BMW style adapter from bunch of electrical parts laying around so I could use BMW charger. Obviously, you wouldn't need to do so for any other batter charger.
    <thumbs up>

    The first thing I do with a new bike is at least attempt to put an SAE pigtail on the battery for charging. Some bikes are extremely easy and it's a 10-minute job -- others are more challenging. If it's too difficult, I then let the service dept of the dealership do it.
    2000 BMW K1200RS
    2004 BMW R1100S
    2005 BMW K1200S
    2016 BMW F800GT
    2018 BMW R9T Pure
    2018 BMW C650GT

  5. #5
    Senior Member exavid's Avatar
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    I wired a 12V coax socket directly from the battery through a five amp fuse to a spot on the handlebar cover just under the handlebar. I put it there so it would be a convenient spot to plug in my Gerbings heated glove and jacket liner controller. I use that connector to plug the battery tender into. I use a Harbor Freight tender (the better one of the two they sell). I've been using it for about three years now with no problems. When we get a long spell of uninspiring scooter weather it keeps the battery topped off nicely. It hasn't hurt the battery which is an original in my 1913GT.
    2013 C650GT 1994 K1100LT

  6. #6
    Senior Member Bornfree's Avatar
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    Version 2 GT: ... I removed the top right tupperware to gain access to the battery, made a small hole in the back of the right cubby bin, ran the wires through it connecting it directly to the battery terminals allowing the battery-tender connection head to live in the right cubby. Took about 20 mins. Whenever I need to “battery tend,” I simply open the right cubby bin and connect it. (pics attached)
    2016 C650 GT in Custom Ruby Red Metallic CC

  7. #7
    Senior Member Bornfree's Avatar
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    Quote Originally Posted by exavid View Post
    my 1913GT.
    Wow 1913 ... that is an old battery!
    2016 C650 GT in Custom Ruby Red Metallic CC

  8. #8
    Yeah, the dealership proposed two methods of running the pigtail: (1) drill a hole and run cable into right bin (like you did) or (2) run the cable out the front without drilling any holes. They suggested the latter saying they don't like to drill or cut if they don't have to. I agreed. I was very pleased with how they did it.
    Last edited by Rodan; 05-10-2019 at 05:06 AM.
    2000 BMW K1200RS
    2004 BMW R1100S
    2005 BMW K1200S
    2016 BMW F800GT
    2018 BMW R9T Pure
    2018 BMW C650GT

  9. #9
    Senior Member exavid's Avatar
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    Quote Originally Posted by Bornfree View Post
    Wow 1913 ... that is an old battery!
    Ya young whippersnapper some of us geezers have weak eyes and faltering fingers. Besides what's a 100 years either way any how? Yeah, yeah I fixed it.

    Seriously however you do it with a pigtail or a permanent socket for the battery charger it's a very good practice to put a current limiting fuse in the new hookup. A direct connection to the battery would make a lot of smoke and burned plastic if the wires ever chafed together.
    Last edited by exavid; 05-10-2019 at 08:50 PM.
    2013 C650GT 1994 K1100LT

  10. #10
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    I am just about to connect one more pigtail to the battery. Just got Zumo GPS from a friend of mine; it came with the fused mount. Planning to mount it just on a top of break fluid reservoir on the right side (RAM mount) and route wires to the battery. Not ideal, but I don't want to mess with BMW mount.

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