Connect with us

UPS battery replacement

Discussion in 'Electronic Repair' started by JK, Oct 9, 2012.

Scroll to continue with content
  1. JK

    JK Guest

    I had to do an emergency replacement last weekend. The bad
    battery was:

    12vdc, 4 amp hour gell cell

    All I could find locally was:

    12vdc, 5 amp hour gell cell

    The batteries are identical except for the amp hour ratings.

    I don't *think* moving up an amp hour should be a problem with this
    type of battery. Am I right?

    Thanks for your time.
  2. Guest

    An increase like that won't hurt, except to need 25% more time to fully charge the battery, and notice that older backup supplies fully charge in 8-12hours, while newer ones need up to twice that time (seems to make batteries last longer). IOW even a much lower charging current won't hurt, and it's only when you switch to a far larger battery that current can become too low (car batteries are rated for 60 amp hours).
  3. Paul Drahn

    Paul Drahn Guest

    It they are the same size, the rating is just a marketing ploy!

  4. mike

    mike Guest

    I've had that same question. I get that cheapo batteries are typically
    lower quality. But how do you tell that an expensive battery isn't just
    a cheapo battery with a higher price tag? They all seem to have the same
    Any advice on brands?
  5. Any advice on brands?

    I've bought lead-acid batteries for several products (lantern, audio
    analyzer, alarm system), and have been happy with CS3 batteries. My alarm
    system uses Power Sonic, but I don't know what that proves.
  6. mike

    mike Guest

    I buy my UPSes at garage sales. They're the cheapo consumer toys that went
    dead and were left in the garage a few more years. Batteries are always
    Power around here rarely goes out for more than a second. If it's out
    longer than that, it's probably gonna be out for longer than an affordable
    UPS could handle. Current system is down to about a minute run time.
    Should replace the battery.
  7. mike

    mike Guest

    APC would be a step up for me ;-)
    I have no need to know what the UPS is doing.
    The lights going out are my clue that something
    It's always good to match the tool to the job.
    For me, a free garage sale ups that keeps my system
    from resetting on a 1-second power glitch gives
    me all the bang for none of the buck ;-)
    But it is time to get a new battery for it.
  8. I buy my batteries from the local Batteries Plus store and they sell
    the "Werker" brand. These are probably not top of the line but they
    are cost effective batteries for service work. For emergency lighting
    applications I've noticed that the equipment seems to charge the
    batteries quite heavily and so they last only about three years. Most
    alarm systems will go about five. I designed and built the charger for
    my own alarm system. I use a common 12 volt 7 amp hour battery and I
    trickle charge it at about a 10ma. rate. This is easily done by
    putting a small incandescent lamp in series with the charging current.
    When the battery is low the lamp is lit. As the terminal voltage
    increases the lamp dims and eventually goes out. The exact lamp
    employed will depend on the battery type,and the magnitude of the
    charging voltage applied. It's a bit of trial and error to find the
    right lamp that will give you the trickle charge you're looking for
    once the battery is fully charged, but it makes a great deal of
    difference in the life of the battery. I've got almost 9 years on this
    one so far and that's pretty remarkable for a Chinese Werker battery.
  9. tm

    tm Guest

    This does sound like maybe an IFR communications service monitor.
    If so, can you give any details on your mod?


  10. tm

    tm Guest

    Ok, no big rush as I need to save up for a round tuit before I get to work
    on it.

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