I just left the "Master" on overnight and came back to a dead battery.  What is the best and safest way to jump or charge the battery in the 912ULS?

  • Re: Battery Charging/Jumping

    by » 2 years ago

    Jumping the plane and quick charging the battery is not a good idea.

    It will be bad for the battery and the large surge currents drawn from the alternator will risk damage to the alternator.


    A slow delicate charge is your best bet.

    If the battery is below 8 volts it may never recover to a usable level.

    The good news is that it was probably a Slooooow discharge so that none of the cells went into reversal.


    Place it on a charger, about 6-10 amps will be good.

    Set the charger to Gell cell mode (Low 14 volts) if available.

    Then watch it take the charge.

    The quicker it gets back above 12volts the better the outcome will be. (<10 Minutes)

    You will want to "Maintain" it for at least a day to equalize the cells.


    After that, remove the Maintainer and check back in 6-10 hours.

    If the battery is still above 12.6, you were lucky.

    If the battery falls below 12v,  it should not be expected to give you reliable service and it is recommended that it be replaced.



    Bill Hertzel
    Rotax 912is
    North Ridgeville, OH, USA
    Clicking the "Thank You" is Always Appreciated.

    Thank you said by: RotaxOwner Admin

  • Re: Battery Charging/Jumping

    by » 2 years ago

    Thank, I'll try that and let you know the results.

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