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    APC UPS ES 500 back up battery doesnt work

    When I plug my ups apc es500 on the outlet it works perfectly fine but when a power outage occurs or if I unplug my UPS in the outlet my computer will turn off and a continous beeping sound occurs without the green light. I tested the battery using multimeter and it works perfectly fine the indicator shows 12volts to 13 volts.. Please help me with this problem. Thanks in advance

    •   Alt9th March 2016, 14:14

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    Re: APC UPS ES 500 back up battery doesnt work

    The batteries can read okay on a voltmeter but then lack the power to drive a load. They develop internal resistance, and this reduces how much Amperes they can put out.

    From my experience with a backup UPS, the batteries only last a few years (whether they are used much or little.) Then they must be replaced. Often they are gel cells. These are not made to have the lifetime of a deep cycle lead-acid battery.


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    •   Alt9th March 2016, 19:42

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    Re: APC UPS ES 500 back up battery doesnt work

    Thank you for your quick response, so are you suggesting me to buy a new battery replacement in my UPS?? Does this solve my issue regarding my UPS? Thank you



    •   Alt10th March 2016, 08:42

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    Re: APC UPS ES 500 back up battery doesnt work

    Quote Originally Posted by BradtheRad View Post
    The batteries can read okay on a voltmeter but then lack the power to drive a load. They develop internal resistance, and this reduces how much Amperes they can put out.

    From my experience with a backup UPS, the batteries only last a few years (whether they are used much or little.) Then they must be replaced. Often they are gel cells. These are not made to have the lifetime of a deep cycle lead-acid battery.
    I call this a design feature. I believe all maintenance free lead acid batteries are gel cells. The capacity also decreases steadily (almost from the beginning) and they rarely last more than 2 years. The ones with external batteries last far longer (one is still alive and kicking after 4 years). I originally suspected that there are some faults in charging program but now I believe that I am wrong, as usual.


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