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Charger circuit for 6v sealed batteries

Discussion in 'Electronic Design' started by Norm Dresner, Aug 16, 2004.

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  1. Norm Dresner

    Norm Dresner Guest

    I've got a bunch of 6v (?lead acid) sealed batteries salvaged from some
    failed UPSs. The batteries are fine but I have no way to recharge them once
    I use the current charge. Does anyone have a URL for an on-line circuit or
    App Note for a charger that will automatically shut off when the battery is
    charged?

    Norm
     
  2. Norm Dresner

    Norm Dresner Guest

    After posting the above, I was scanning for something entirely different and
    came across this circuit which looks quite adaptable.

    http://www.elecdesign.com/Articles/ArticleID/1823/1823.html

    Norm
     
  3. budgie

    budgie Guest

    I'd recommend the UC3906 from Unitrode/TI. The AppNote hides out there on the
    web as SLUA115.pdf and contains much useful care_and_feeding information.
     
  4. Pooh Bear

    Pooh Bear Guest

    The likes of Yuasa have very helpful info.

    Lead-acid charging is typically constant voltage as opposed to constant current
    for Nicads and Ni-Mh etc.

    http://www.yuasa-battery.co.uk/Redbook5.html


    Graham
     
  5. Michael

    Michael Guest

    If your batteries are lead-acid, you cold use an automotive battery
    charger.

    Back in 1976 or so I fell heir to several 6-packs of Gates 2v 5AH
    cells. From that time to the present I have charged them with the car
    battery charger I built (from a circiut in a Motorola SCR data manual).
    To date, only about half the 2v cells have gone bad, had to be tossed
    out. Some of the remaining cells form a UPS for a temperature data
    logger I built.
     
  6. budgie

    budgie Guest

    Many many automotive battery chargers lack the regulation required to properly
    charge a SLA.
    These Gates (Cyclon) cells have an interesting characteristic, in that the
    published data states that they can be connected directly to a low impedance
    voltage source at the float voltage regardless of state-of-charge, and will
    withstand the sometimes huge inrush current. The average prismatic SLA won't
    handle that at all.

    Too high a float voltage will kill the Gates/Cyclon cells in short order. We
    have a communications test set (by a well-known US maker) where the charge
    circuitry is a total crock, as are the float voltage setting intructions in the
    maintenance manual. These would regularly kill a set of those same Gates/Cyclon
    2v %.0Ah X cells.
     
  7. Gary Lecomte

    Gary Lecomte Guest

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