Conclusionīefore you throw away or replace your AGM battery, there are simple ways you can use to test the condition of your battery to confirm if is bad. If the figure you get on the tester is less than the calculated ampere figures, the battery is bad, and you need to replace it. Then compare the two figures the one you got after dividing the amperage by two and the one you got after performing the load test.
Attach the load tester to your battery to perform the load test, let it run for 10 to 15 seconds, and then stop it. The figure you will get is what you should get after performing the load test on your battery. First, you will need to calculate the normal load on your battery.įind the ampere rating on your AGM battery, usually indicated as Cold Cranking Amps (CCA) or Ampere hours (Ah), and divide the indicated number by two. Performing a load test using a load tester on your AGM battery is another accurate way to tell if the battery is bad. You can also try to recondition the AGM battery to get rid of battery sulfation. However, if your battery has a normal voltage reading and cannot still hold a charge, it is most likely sulfated, and you need a new battery. Since the AGM battery is completely sealed, you may not be able to obtain individual cell readings like in a flooded lead-acid battery. If the battery is charged and the reading does not reach over 10.5 volts, there is a good chance it has a dead cell. If your battery’s voltage reads 0 volts, it is most likely the battery has a short circuit. In most cases, a fully charged battery has a voltage slightly higher than 12 volts to 13 volts. Hold the multimeter probes steadily and firmly to obtain a stable reading. Compare the reading on the multimeter to the standard voltage of your battery usually listed on the battery side. c) Lastly, measure and record the voltage. Set the positive probe to the positive terminal of the battery and the negative probe to the negative terminal. Remember to confirm the voltage sign on the multimeter where the probes originate. The multimeter probes are color coded with black being negative and red positive. b) Next, connect the multimeter to the battery. If the battery you are measuring voltage is 12 volts, select a voltage of 20 on the multimeter. Select a voltage that is higher than the battery voltage.
Then turn the dial or press the right button on the meter to set the multimeter to measure direct current. įollow the below steps to measure the voltage of your AGM battery.
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invest in a battery monitoring device like this Hioki manual multimeter or a digital multimeter like this Astrol AI digital multimeter. You can check the voltage in your battery using a multimeter. The voltage reading is a reliable method to know if it can still hold a reasonable charge. You can also use your AGM battery voltage reading to gauge whether it is bad. A short circuit will cause a rapid increase in heat inside the battery which can make the battery cell melt, or in a bad scenario, the AGM battery may explode.Įarly detection of such problems can help avert the damage to your battery and even injury. You should not try to charge a damaged battery as this may cause a short circuit which is very dangerous. Such damages will compromise on the integrity of the battery and it will not be able to store charge.
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If it’s faulty, you might identify discoloration, bulge or bump in the battery’s case, excessive leaking, or a crack or rupture of the exterior. In fact, inspection should be the first step if you suspect your battery is bad. One of the basic and easiest ways you can tell your AGM battery is bad is by performing a thorough visual inspection of the battery. Below are some ways to test your AGM battery and determine if it’s bad. There may be other underlying reasons making your battery hold charge. If you notice your AGM battery is no longer holding a charge, don’t just assume the battery is bad.
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