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how to check and to know you bought a bad battery | Getting Started

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Posted in: General

how to check and to know you bought a bad battery

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  • jmnzaljon

    hi guys,

    i just want to know what tools to use and how to use them when checking for a bad ups battery.

    thank you in advance!

  • MattK


    There are many things that can indicate a battery is bad

    One of the simplest things you can do with a multimeter set to VDC is measure the voltage across the terminals, if for instance the battery is a 12v battery if it was below ~9.6v it would be considered bad. 

    A battery might show a good voltage when it isn't connected in circuit so it is worth also measuring when it is connected as well.

    It is also worth doing a run time test as even if all the above is ok you might find that you get a short run time when the battery is actually in use.



  • jmnzaljon

    thanks for the tips matt. and oh i have a 12v battery and measured it using a digital meter the result is 12.47V based on your answer its a good battery, but when i installed it in my ups it gives out a constant tone along with the on line led and replace battery led alternating.

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