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  1. #1

    Can you use a battery tender on a ski with battery hooked up?

    without knocking out the stator? or should I always unhook the battery?


  2. #2
    Click avatar for tech links/info, donation request K447's Avatar
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    There is no problem using a Battery Tender or Battery Maintainer type charger as long as it is appropriate for the small PWC type batteries. These 'smart' devices monitor the state of charge in the battery, and provide precisely the amount of charge necessary to maintain 100% charge, without any overcharging. good maintainer will charge the battery up as needed, then keep it charged.

    If you have an AGM type battery installed, make sure the charger is rated for use with AGM batteries. Many cheap chargers do not have the correct setting for use with AGM batteries.

    What you do NOT want is a simple 'trickle charger'. Trickle chargers typically pump a fixed rate of charge current into the battery, even if the battery doesn't need that much. Even a 2 Amp 'trickle' is way too much output to maintain a PWC battery. Overcharging the battery will greatly reduce its service life, especially if left connected to the charger for months.

  3. #3
    Click avatar for tech links/info, donation request K447's Avatar
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    Notes regarding disconnecting and re-connecting the battery.

    Always disconnect the negative battery post first, and reconnect the negative battery post last. This reduces the chances of a tool accidentally shorting against something and creating sparks, or worse.

    Always, always, double check that you really are connecting the red battery cable to the Positive + battery post. Reversing the battery connections can cause a lot of damage to the electrical system. After you tighten the red cable, check again that it is on the + post. THEN connect the Black battery cable to the - post.

    When connecting the negative lead, always try to make the connection quick and cleanly, then hold it snugly in place while you tighten the battery post bolt. What you don't want to do is have the connection make and break rapidly as you jiggle it into place. The electrical pulses such jiggling creates can cause the MFD hour counter to reset, simply become confused, or sometimes fail completely.

    If you want to be extra safe, you can unplug the MFD connector from the back of the MFD, then connect the battery posts. Plug the MFD in again once you are finished with the battery install.

  4. #4
    jackofalltrades's Avatar
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    Quote Originally Posted by K447 View Post
    What you do NOT want is a simple 'trickle charger'. Trickle chargers typically pump a fixed rate of charge current into the battery, even if the battery doesn't need that much.
    I can atteast to that. I smoked a nice deep cycle battery for my boat by leaving it on a cheap 2 amp trickle charger last winter. Since then, I purchased a Sears Diehard microprocessor controlled charger that has options for several trypes of batteries including agm and gel cells and even has a float charge option.

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