Battery Tender junior is boiling my battery? Normal?

Discussion in 'Motorbike Technical Discussion' started by Ryan, Nov 16, 2003.

  1. Ryan

    Ryan Guest

    I own a Battery Tender Junior. When I put it on my Suzuki GS500E it
    starts boiling the battery almost immediately. Is it supposed to do
    this? I checked the voltage while it was on there and it was about

    Ryan, Nov 16, 2003
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  2. Ryan

    Tim Morrow Guest

    Voltage is high (13.6 - 13.8 is more normal) but not so high that it should be
    boiling your battery.
    Tim Morrow, Nov 16, 2003
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  3. Ryan

    Charlie Gary Guest

    How many amps to go with those volts?




    fix the e-mail address and it will get to me
    Charlie Gary, Nov 16, 2003
  4. Ryan

    Mark Olson Guest

    According to [1] it should put out up to
    0.75A, at up to 14.4V. How vigorous is the 'boiling' you speak of?
    If it is just generating some bubbles, that is normal. If it is
    very violently boiling the battery something is wrong with either
    the battery or the charger. Unless the bubbling is very violent,
    I would leave it on for a while and see what happens to the voltage.

    Mark '01 SV650S '81 CM400T '99 EX250-F13 DoD #959635 RFB #2

    Battery Tender Junior - 12V @ 0.75A $42.55
    Battery Tender Junior's lightweight, compact size makes it ideal for
    those hard-to-fit spots. The trickled charger with a brain will assure
    batteries are maintained after charging and allows ready to go!

    Fully automatic two-stage lead-acid battery charger. Perfect for all
    lead-acid, sealed maintenance free and gel cell batteries.

    After reaching peak 14.4 VDC, charger automatically switches to 13.2
    VDC float voltage.

    When voltage drops below 12.6 VDC, charger resumes charging back to
    14.4 VDC.

    Solid state two color LED indicates stage of charger.

    Spark proof.

    Reverse polarity protected.

    12' output cord.

    5 year warranty
    Mark Olson, Nov 16, 2003
  5. Hygrometer would help detect a bad cell. If one of the cells is
    shorted, instead of a 12 volt battery, one now has a 10 volt one
    or something in between. Charging voltage would be too high for
    that situation. But then this is getting too technical for this
    forum. - HPT
    High Plains Thumper, Nov 17, 2003
  6. Ryan

    Ryan Guest

    How many amps to go with those volts?

    I didn't check, but the charger is rated for 750 ma, as someone

    I checked the battery again 36 hours later and it was not boiling, and
    the battery tender indicatior had switched from red to green.

    It was not violently boiling, but boiling more than just a few bubles.
    I could hear it pretty easily. I will see what happens next time I
    put it on, and I do have a hydrometer I can test it with. Thanks for
    the suggestions.

    Ryan, Nov 17, 2003
  7. Most likely it was nearly flat when you started charging. You might
    want to check the voltage a few times to make sure it'll hold a
    charge, but if it'll hold a reasonable voltage, there's no real
    need for a hydrometer. If it won't hold its voltage, buy a new
    battery and don't worry too much about which particular cell is bad.
    r_kleinschmidt, Nov 17, 2003
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