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UPS battery problem

Discussion in 'Electronic Repair' started by Daniel Prince, Oct 30, 2006.

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  1. A few months ago, my brother replaced the sealed lead-acid-battery
    in his IBM brand UPS. The UPS worked for a month or so and then it
    quit working. The battery supplied outlets were dead and an LED on
    the front panel with a sine wave graphic was blinking.

    We opened it up and we could not slide the battery out. I had to
    cut the case of the UPS up, with tin snips, to get it out. The case
    of the battery has a substantial amount of distortion with bulges
    and indentations.

    Last Saturday, I went to the TRW swap meet and talked to the vendor
    who sold my brother the battery. She said that he must have
    connected the battery in reverse. I told her that it had worked for
    a while and she said that it would work with a reversed battery
    until the charging circuit tries to charge the battery.

    I am 99% sure that this is BS. What do you think? Thank you in
    advance for all replies.
  2. Meat Plow

    Meat Plow Guest

  3. w9gb

    w9gb Guest

    As reported earlier, primary problems with UPS - listed by frequency (as
    reported by UIS)

    1. Dead battery - lead-acid are good for only abut 3 years (5 years max) in
    this type of service.
    2. Inverter goes bad
    3. Charger circuitry goes bad -- either not charging or overcharging the

  4. JW

    JW Guest

    As far as it operating with a backwards battery - I think she's full of
  5. plutonium233


    Nov 1, 2006
    The inverter won't work with the battery in backwards. The blinking light with the sine wave sounds like an inverter problem, but it would be a good idea to check the owner's manual.

    Try disconnecting the battery and using another power source to test the inverter. Then I would check the charging voltage as well. To check the charging voltage, check it without a battery so see if it is even putting out anything. If you get any voltage reading (within reasonable range) hook it up to another battery and make another measurement.

  6. Baron

    Baron Guest

    A bit late.... But are not the two connectors different sizes ?
    The Yuca 12v sealed battery in mine has two different sized terminals !
  7. Guest

    First lead acid battery I made ran quite happily either way round. I
    think, but am not certain, that a commercial battery will chemically
    reform and work fine backwards, but of course without the benefit of
    the various tweaks that distinguish modern lead acids from basic lead
    sheet cells.

    However failure after just one month is due to something else entirely.

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