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Extra battery wire in UPS. Voltage-sense? or what?

Discussion in 'Electronic Repair' started by mc, May 31, 2007.

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  1. mc

    mc Guest

    I'm replacing the batteries (2 x 12V, in series) in a Best power supply from
    the early 1990s.

    Obviously, I have a negative lead, a jumper to put the two batteries in
    series, and a positive lead.

    Attached (with tape) to the red positive lead is a white wire with a smaller
    female spade connector on the end of it. The person who previously replaced
    the batteries did not connect the white wire to anything. What should it go
    to?
     
  2. JR North

    JR North Guest

    It should connect to a temp sensor buried between the cells and used to
    detect an overcharge condition.
    JR
     
  3. mc

    mc Guest

    Thanks. I was thinking temperature sensor but didn't see one. I'll look
    more closely. It's possible the previous person discarded it. (Maybe it
    was stuck to a battery and was discarded with the battery.) That, in turn,
    may be why the batteries lasted only 3 years in light use.
     
  4. mc

    mc Guest

    I found the battery replacement instructions on www.bestpower.com and they
    say not to connect the white wire to anything at all -- which leaves
    completely open the question of what it was originally for.

    Its connection on the circuit board is labeled SM or WS depending on whether
    you read it right-side-up or upside-down.
     
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