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Car battery in UPS?

Discussion in 'Misc Electronics' started by notme, Jul 25, 2009.

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  1. notme

    notme Guest

    Observing proper safety (ie, not using it inside the home), is there any
    reason using a car-sized 12v gel-cell (eg, Optima*) would be a Bad Idea (tm)?

    Form-factor is not an issue; the battery would be outboard, of course.

    Charging time would be much longer considering the modest charge current of
    the UPS, but so would be the discharge time.



  2. Sylvia Else

    Sylvia Else Guest

    Are you sure the available charge current will exceed the self-discharge
    of the battery?

  3. Nico Coesel

    Nico Coesel Guest

    You should use a sealed battery. Car batteries may leak accid and H2
    gas. Most UPS I've seen have a fuse in series with the battery. Make
    sure to retain the fuse. I'm not worried about the charge current. An
    UPS is usually fully recharged in a couple of hours.
  4. PeterD

    PeterD Guest

    Any deep-cycle LA battery would work.
  5. Should work with out a problem, except for charging.
    IF you want an indoor friendly battery look at the AGM, they don’t gas
    like LA's.

  6. Andrew

    Andrew Guest

  7. notme

    notme Guest

    That's a *great* primer on LA batteries of all types (liquid, gel, AGM,
    deep-cycle); there's not a type that's not described.

    "Myth: The old myth about not storing batteries on concrete floors is just
    that - a myth. This story has been around for 100 years, and originated back
    when battery cases were made up of wood and asphalt. The acid would leak from
    them, and form a slow-discharging circuit through the now acid-soaked and
    conductive floor."

  8. Heres the real Battery FAQ <>

  9. Rich Grise

    Rich Grise Guest

    You say, "Car-sized"; but you haven't said if it's a car battery or a
    deep-cycle (RV, Marine, golf cart).

    Don't use a car battery. They're good for 600 cold cranking amps, but
    crap for deep-cycle applications.

    If it is, in fact, a deep-cycle battery, then there should be no problem,
    as long as your UPS can keep it charged, as has been mentioned.

    Good Luck!
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