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If you know how to test a charger, whether it’s a rechargeable one for small electronics or a car battery, you’ll know if it’s getting the right amount of charge. The charger test process is relatively the same regardless of the battery type. You need to connect the negative and positive probes of the multimeter to the respective contacts on the charger. The meter will display the output voltage of the charger.
Steps
Check small battery charger
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Plug in the charger. To determine if the charger is delivering the expected amount of power, you need to first connect the charger to a power source. Plug the power cord into a nearby AC outlet for the charger to start charging. You will measure this voltage with a multimeter. [1] X Research Source
- If the charger has its own On/Off switch, turn the switch to the “On” position.
- A multimeter (sometimes called a “voltmeter”) is used to check the voltage levels of various electrical devices. You can buy a digital multimeter at any electrical appliance store or online for an average price of 200,000 – 500,000 VND. [2] X Research Source
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Connect the probe of the multimeter to the corresponding port. Most multimeters come with a pair of black and red detachable probes that measure the current flowing through the battery or charger terminals. Plug the black cathode probe into the “COM” port, and the red anode probe into the “V” port on the multimeter. [3] X Research Sources
- Depending on the design of the model you are using, in some cases the probe port may be marked by color instead of text.
- If your multimeter has a built-in probe, you can skip this step.
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Set the multimeter to “DC” mode. Find the dial that shows the different settings on the tool. Turn the knob to the “DC” range and stop at the next highest setting relative to the charger you are about to measure. This is a preparatory step for testing the charger with DC current.
- To test AA batteries with an expected voltage of about 1.5V, you need to select the “2 DCV” setting.
- “D [4] X Research Sources
Warning: Using the wrong multimeter can cause overload and even more serious damage such as fire and explosion. To avoid this, you need to make sure that the multimeter is in the correct mode for the type of current you’re about to measure, and set it to a higher voltage than the device under test.
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Connect the black probe to the cathode contact on the charger. If the charger you’re testing connects to the battery through the power supply port, touch the probe to the metal pin at the end of the jack. If you are testing a base charger similar to an AA battery charger, touch the probe to the bare metal marked “-” located on the side of the charging chamber. [5] X Research Sources
- Some multimeters have input ports that support direct connection of certain types of power jacks to the instrument.
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Connect the red probe to the anode contact on the charger. Insert the probe into the metal pin located at the end of the power supply jack. For docking chargers, you need to insert the probe into the bare metal marked “+” on the side of the charging chamber. [6] X Research Sources
- If you confuse the two poles, the multimeter may show a negative reading (or no reading). At this point, swap the two probes and measure again.
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Check the number displayed on the multimeter display. This number represents the number of volts of DC current supplied by the charger. The battery charger needs to transmit a voltage equal to (preferably higher than) the battery level in order to be able to fully charge in time. [7] X Research Sources
- If you don’t know which number is correct, check the manual that came with the charger, or find the information somewhere on the device itself.
- For example, a standard lithium ion battery has a voltage of about 4 volts. Larger electrical appliances may use batteries/batteries with a capacity of 12-24 volts. [8] X Research Sources
- If the test readings are below the recommended level, it’s time to buy a new charger.
Check the charging capacity of the car battery
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Turn on the car’s electrical system. After turning on the key, open the headlights to use and suppress the surface charge that the battery can accumulate. However, do not rush to start the car. Before checking the charging capacity of the battery, we will proceed to take the “static” indicator to see the current charge level of the battery. [9] X Research Source
- If you want, you can also turn on the radar, blower, emergency lights, and other electrical components to dissipate more power. [10] X Research Source
- The surface charge suppression step will help the indicator accurately reflect the generator’s charging capacity.
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Set the multimeter to “DC.” Turn the knob on the multimeter to a mode designed to measure DC current in the next highest voltage range against a car battery. like batteries for small appliances, car batteries use direct current to power engines, headlights, fans and other electrical components. [11] X Research source
- Car batteries typically provide 12 volts, about 6 times more than household batteries. To avoid overloading the multimeter, check to make sure the device is set to a higher voltage than the battery (most 20 DCV). [12] X Research Source
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Connect the multimeter probe to the two battery terminals. The best way to proceed is to insert the probe into the space between the battery terminal and surrounding metal fittings. This will ensure that the probe does not fall off during the measurement. You need to find and connect the probe to the cathode first, and then to the anode. [13] X Research Source
- Immediately after connecting both probes, the multimeter should show something in the range of 12.6 volts. This is the static voltage of the battery, this indicator only shows that the battery is still charged, not the charging capacity of the battery. [14] X Research Source
Tip: You can use alligator clips to secure the probe to the terminals. [15] X Research Source
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Start the car. The reading on the multimeter will drop suddenly as soon as the starter uses power from the battery. Let the engine continue to run for about 5 minutes to allow the generator to charge for a while. [16] X Research Source
- If headlights or certain electrical components dim or turn off momentarily when you start the car, this could be a sign of a problem with the battery.
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Turn off the device completely and see if the display reading falls around 13.2 or higher. Turn the key to turn off the entire system including lights, radios and other electrical appliances. At this point, the multimeter will display the new reading. If this reading is higher than the battery’s static voltage, the generator is stable and the battery is properly charged. [17] X Research Source
- If the readings do not change then there is a chance that the generator is damaged. You should arrange to have your vehicle checked at a professional garage. [18] X Research Sources
- If you are testing an external battery charger, a reading in the same range indicates that everything is fine.
Advice
- If you don’t know if the battery is charging itself properly or don’t understand what the voltage reading indicates, take your vehicle in for a full electrical system check.
Things you need
Check small battery charger
- Small battery charger
- Multimeter
Check the charging capacity of the car battery
- Car battery
- Multimeter
- Alligator clip (optional)
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This article is co-authored by a team of editors and trained researchers who confirm the accuracy and completeness of the article.
The wikiHow Content Management team carefully monitors the work of editors to ensure that every article is up to a high standard of quality.
There are 14 references cited in this article that you can view at the bottom of the page.
This article has been viewed 2,464 times.
If you know how to test a charger, whether it’s a rechargeable one for small electronics or a car battery, you’ll know if it’s getting the right amount of charge. The charger test process is relatively the same regardless of the battery type. You need to connect the negative and positive probes of the multimeter to the respective contacts on the charger. The meter will display the output voltage of the charger.
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