Connect with us

Charger circuit for 6v sealed batteries

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

Scroll to continue with content
  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

  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.

  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.

  5. Michael

    Michael Guest

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

    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

Ask a Question
Want to reply to this thread or ask your own question?
You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.
Electronics Point Logo
Continue to site
Quote of the day