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Can a battery charger/conditioner be used on smaller batteries

Discussion in 'Electronic Repair' started by Bob F, Jun 10, 2007.

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  1. Bob F

    Bob F Guest

    I acquired a marine battery charger/conditioner (Promativ 40-3). I
    just tried it on the battery from a lawnmower which at first showed
    less than 7 volts (12V battery). My car battery 10 amp charger could
    barely get any current into the battery (barely moved the meter).
    Leaving the battery on the new charger overnight seems to have
    restored its ability to hold 12V.

    What I am wondering is, would it be reasonable to use this charger
    (It's rated for 40 amps) to charge smaller batteries like the 5 amp
    hour gel cells from a UPS? I would think that it is regulating for
    voltage, and monitoring the battery voltage to determine when to
    reduce the charging voltage. I have a number of these batteries which
    I'd love to restore to semi usable condition. Is it reasonable to use
    this charger on them?

  2. mc

    mc Guest

    If they need restoring, you have nothing to lose. I haven't done it, but I
    think you're probably on safe ground since lead-acid battery charging is a
    matter of regulating voltage rather than current. How does the restorer
  3. Bob F

    Bob F Guest

    The best I can find suggests that it applies full current until it
    reaches 14.6 volts. It then hold 14.6 for 1-4 hours. After that it
    reduces to 13.3 volts from then on.

    The model, by the was is promatic 40-3, not promativ.

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