reference the battery charging question.

Discussion in 'UK Motorcycles' started by eatmorepies, Apr 17, 2010.

  1. eatmorepies

    eatmorepies Guest

    Is it necessary to disconnect the battery from the bike before charging it?
    My 650 Transalp has a power socket under the seat that would make charging
    very easy - book says disconnect battery. I never did it when I charged car

    eatmorepies, Apr 17, 2010
    1. Advertisements

  2. eatmorepies formulated on Saturday :
    A modern bike should not suffer any damage if a modern charger (voltage
    limited) is connected without disconnecting battery from bike. If using
    a very old charger (not many about now), then certainly you should
    disconnect it.
    Harry Bloomfield, Apr 17, 2010
    1. Advertisements

  3. eatmorepies

    wessie Guest

    What he says, mostly. As with the reply to TOG, you need to know what fuse
    is connected to the accessory socket. If it is factory fitted then you
    should find the rating in the handbook. If it is an aftermarket one then
    find the inline fuse and check it's value. Anything over 10A should be
    fine. If the socket was fitted with a low current device in mind, and has
    wiring to match then proceed with care, as you could generate heat, smoke,

    If using an Optimate then just connect it - they only pump out 0.8A
    wessie, Apr 17, 2010
  4. eatmorepies

    ian field Guest

    My optimate came with interchangeable leads, you can swap eyelet termials
    that bolt to the battery lugs for the regular alligator clips. That seems to
    imply that Optimate consider their product suitable for hooking up to an
    under seat plug, without the hassle of disconnecting the battery.

    There was some mention in the instructions that some electrical systems draw
    enough parked current (clock, alarm etc) to give a false fail indication.
    ian field, Apr 17, 2010
  5. eatmorepies

    wessie Guest

    only an issue for a deep discharged battery, where any active devices will
    suck in all of the Optimate's output. In that instance, it would be best to
    connect another battery in parallel with the bike battery until the
    Optimate gets past the diagnostic cycle. Once the optimate is in charge
    mode you can disconnect the other battery.
    wessie, Apr 17, 2010
  6. No
    The Older Gentleman, Apr 17, 2010
  7. eatmorepies

    ian field Guest

    Except doing all that is just as much hassle as just unbolting the negative
    lead, and in the case of a sulphated battery it would defeat the de-sulphate
    ian field, Apr 17, 2010
  8. eatmorepies

    wessie Guest

    <threads passim>

    Disconnecting the battery can be a PITA: see Gyp's post. Applying jump
    leads in parallel can be simple: see my reply to Gyp re. starter motor

    Sometimes, the Optimate is too clever for its own good, declaring a
    perfectly viable battery dead. Doing the parallel battery thing overcomes
    the false negative. Also applies if using an optimate to recharge a large
    capacity battery where the large inrush current sets the optimate into
    panic mode.

    I use an Optimate as my only battery charger. It is an excellent device but
    the control circuitry is flawed and should not be relied upon without
    corrobatory evidence from applying basic physics.
    wessie, Apr 17, 2010
  9. eatmorepies

    ian field Guest

    Horses for courses I suppose, I have several different types of battery
    charger - some home made, and they all serve some purpose or other.
    ian field, Apr 17, 2010
    1. Advertisements

Ask a Question

Want to reply to this thread or ask your own question?

You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.