# How to load test a battery with a multimeter

How to Test a Battery with a Multimeter?

Mar 21,  · How to perform a quick, accurate test of a volt car battery using your meter's MIN/MAX function. How to Test a Car Battery With a Multimeter Prepare Your Multimeter. Set your multimeter to voltage and ensure it's adjusted to 20 DC volts, or if your voltmeter Touch the Probes to Your Battery Terminals. Press each probe to the correct terminal, touching negative to negative and Check the.

The photo shows an inexpensive often free multimeter from Harbor Freight. I added a white dot to the indicator. Notice that the white dot points to a battery test function for 1. Batteries should normally be tested under a load because a no load voltage test could read normal, what is history book review drop considerably when the battery how to keep organized in high school under load.

This multimeter's manual indicates that the battery test circuit adds ohms of resistance as a load. According to the label on the meter, a 1. There is nothing mysterious about this. Factored, that is current I equals voltage E divided by resistance R. This is not my better meter, but one I needed in a second location. It does not have a battery test function, but I decided it would be handy to add one. I can use the m function. But, I will need to add about ohms in resistance when in use.

My better meter also does not have a battery test function, and I made one of these resistor probes for it, too. It would be ideal if I could have gone to Radio Shack to buy a pack of ohm resistors, but they are not available. I rummaged through my junk box and found a ohm resistor and a ohm resistor. Soldering these two end-to-end series gave me one resistance of about ohms. Resistors are usually not exactly their stated value, but vary just a little.

Check the actual resistance with the Ohms function on your multimeter. My chain of resistors is actually ohms. Also, resistors use a color coding system to indicate their value. The colors shown on the resistors in the illustration are accurate for the values indicated. See the second photo. I soldered a small alligator clip to one end of the resistors. I slipped a soda straw what to look for in a band saw them and added some hot glue at each end to provide some physical strength.

I scraped the resistor lead opposite the alligator clip to remove any hot glue that might act as insulation. I could have brought the ohms down to exactly ohms by soldering another resistor of ohms in parallel to the two resistors.

Resistances in parallel function differently than resistances in series. Adding 19, ohms, if such a resistor were to be available, is more of a hypothetical example than a serious suggestion.

Here is an on-line calculator for parallel resistances. To use, just attach the alligator clip to one of the test leads. Set the multimeter to the milliamp scale. Use the bare resistor lead as the probe. Touch the probes to the battery under test. It is easy to forget what the thresh hold figures are for testing batteries. I made a label for the back of the meter. My figures are not quite accurate, but are close. It may well be that a battery considered depleted in one application would still function in a less demanding application.

The battery that read 3. You can easily make your own resistance load from resistors in your junk box for checking common batteries under load with a meter you already own, even though it may not have a battery test function. What is the hostname for hotmail meter contains a fuse. It is easy to blow the fuse if the selector was set to the wrong range for a test you performed recently. If the fuse is blown, the milliamp scales will read zero 0.

At first you may wonder what is wrong. You simply need to install a new fuse. The fuses used by this particular meter are not easy to find locally.

I ordered a package of five from Amazon. I have three different multimeters with 3 different dedicated battery load tests. Their spec sheets read as follows: Tacklife DM 1. Why does each meter choose a different load and manner of designating load? Which loads are preferred? I would think that the higher the voltage of the battery the higher the ohm load should be, like in the Bside; not like the Tacklife DM Use a voltage reading instead of a current reading.

You can put your load resistors across the battery in parallel instead of on one end in serial and then take your how to save power consumption at home reading across the battery as well.

If you get 1. If the voltage drops significantly lower than that then the battery is dead. An advantage to this method is that you won't have to worry about blowing fuses on your meter. This is a great instructable. I only had one side comment about resistor values. Reply 1 year ago.

Thank you. You make a good point. I do usually check. My nominal Ohm resistance came in at Ohms. There is nothing magic about 4mA for 1. It is only saying that is what it draws. In fact, a 1. I'd flip those numbers around. They are just being cheap and putting one range on there to measure both. It'd be better if you were to add separate inputs to your adapter, maybe load the 9V cell to 10mA and the 1. Not sure if I can replace this battery with four 1. Please comment on this as well.

Reply 6 years ago on Introduction. You can use this same method to test the battery. However, when a battery will not reach a full charge, the battery is defective.

You should be able to test the lamp with four 1. What does the 48 volt battery power? Can you measure the current flow in the circuit when its normal load is connected? Then you would use Ohm's Law to compare what the battery produces with what it should produce.

Otherwise, a standard battery test uses a carbon pile to handles. Carbon pile testers are very expensive. Most you would find are likely to be for 12 volts. A tester for a 48 volt battery would be even heavier duty.

I do not know where you would find one. This is the best answer I know. I see you posted this question eleven times various places. Perhaps you could delete the other ten. Could you please explain why do you ask the battery power? From where I can get to know this? Without knowing the power if I blindly connect ohm what would be the consequence? And lastly, why you chose ohm?

The ideal would be to connect the meter to a resistance that is the exact resistance of the load in the device the battery will power. Sometimes the voltage of a battery not under load appears to be good, but the battery is too far depleted to provide the current needed to power the device. Adding a load of about Ohms to the battery gives a better indication of whether the battery is still good. Even then, one application or device may how to calculate commission on sales able to work on a very low current draw with a weak battery while another device needs a fresher battery because that device draws more current.

I suspect you mean current. Power usually means Watts. Do you know Ohm's Law? Voltage equals amperes current multiplied by resistance Ohms. Watts equal volts multiplied by current in amperes.

Step 1: No Battery Test Function on Your Meter

Oct 30,  · DIY Battery Load Test With a Multimeterthe easy way.. Using a Cranking motor, or starter motoror lights on a likedatingus.comy tested, normal lead battery, and als. How to check car battery with multimeter. The first test with your multimeter will measure DC voltage, indicated with a solid line and a dashed line above a letter V. Set the dial to 20, which will allow you to accurately measure between Volts. Touch the red probe to the positive terminal, and the black probe to the negative terminal. To use, just attach the alligator clip to one of the test leads. Set the multimeter to the milliamp scale. Use the bare resistor lead as the probe. Touch the probes to the battery under test.

Disclaimer This article may contain affiliate links, this means that at no cost to you, we may receive a small commission for qualifying purchases. With so many battery operated products in the house, multimeters have become the need of this day. Today, we are here to tell you how to use one correctly. From TV and AC remotes to battery operated lights, there are a lot of products that need proper functioning cells to run. Even our cars cannot run without cells.

With multimeters available on the internet and in shops, it is easier to buy one and take care of all your batteries at home itself.

As such, you would not need to visit a mechanic at a garage. Read on to learn how to measure voltage levels for different types of cells. Also, we will tell you how to understand when to buy new batteries because they are running out of juice. Firstly take a multimeter and place it on the table.

Also, bring in the battery you want to test. We will explain the process with a 9-volt battery for this guide.

To correctly measure the voltage, turn your switch dial to DC voltage measurement. This needs to be done because a battery generates DC power, and this means you will need to measure it with the same unit.

So it is essential to know the maximum voltage of the battery. Set the dial to 20 volts, which is the maximum range. Connect the test probes to your cell, with the black wire meeting the negative. The red wire should meet the positive and then check its display. If you get a number which is higher than 7 for a 9-volt battery, it is still usable, and the cell will last for some more time. On the other hand, if it is a dead battery, it would show results below 1.

If that is the case, it is time to buy a new one. Mostly, it is enough to just check the voltage to get a clear understanding of the battery. But if you have to ensure that it can supply sufficient current to a load, you would need to measure the amperage in milliampere-hour mAh.

We will discuss this in the next part. So here we will talk about how to get accurate measurements of the current of a battery. The average amperage of the battery would be somewhere around mAh. So before measuring, turn the dial to DC function and keep it at mAh.

Again connect your test probes in a similar way where the black wire meets the negative. The red one should connect to the positive. After you are done, check the reading on the display. If it fluctuates somewhere around mAh, it is working alright and will run any small device efficiently. We tested it on our TV remote control battery, and we got While testing your battery, if you find the number to be below half the voltage level of any cell, it is time to replace it. This is because once a battery reaches its midpoint, it starts to drain away quickly.

If you do not have a digital multimeter, you can also try using a simple voltmeter or an analog multimeter. These do not come with a digital display but will let you take accurate measurements with a facility to read it from the scale directly.

A digital variant is easier to use and will always be the preferred choice, but again, it is not the only way to get the job done. There are a number of multimeters available in the market today that simulate a load to test the battery.

These devices can be great additions to your tool collection. If your car battery is causing problems or you have an issue with dim headlights or delayed ignition, a multimeter can come to the rescue.

This product can also be used to check the health of heavy-duty car batteries or alternators. Though you can already see the battery level on your dashboard display, it may so happen that the battery has completely drained out. The process is the same as above. You would need to connect the probes to the battery terminals. Then proceed to check the reading on the multimeter display.

The battery ratings vary a lot from car to car, but choosing Volt is good enough. We selected 20V before proceeding to measure the level. Allow us to give you a piece of advice here — you should keep the headlights on for a few minutes before checking the battery.

This would drain away any remaining charge. If your measurement is more than the minimum value, which is usually 12 volts, the battery has a good charge and will last. However, this is not the only way to judge if the battery is in perfect condition. One also needs to check if the car is able to draw power successfully. A quick way to come to a conclusion is to test the cold cranking amps CCA that trigger the ignition.

Most car batteries tend to function well for years before deteriorating. To test the cold cranking Amps, keep your multimeter connected to the battery terminals and then fire up the ignition of your car. This is a job for two people, where one needs to take control of the ignition while the other checks for fluctuations while the engine is cranked up. The ideal situation would be if the reading drops to 10V but then returns to a higher value around 12 V.

If the reading stays constant after the initial value drop, then you would know your battery is in perfect condition. The engine needs to be running throughout the process. If the initial reading is around 5V and not below it, you should know that the battery is slowly dying and would not work for long.

Also, if the reading is way below 5V, then it is time to replace the cell. Make sure that you do not try to do it all by yourself. Now you know how to go about using a multimeter to test batteries. It is fairly easy once you are well-versed with the process.

However, we strongly recommend that you practice on different cells to get the hang of it. Maybe consider practicing with the different batteries used for household items like the remote, video game, torch, and even a battery from a lamp. The more you play around with different cells, the better you understand various charge positions. We hope this guide was helpful in explaining to you how to test a battery with a multimeter.

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## How to load test a battery with a multimeter: 5 comments

1. Arashigami

Thank you for the detailed review and also for the discount links

2. Maugal

I also wanted to say that the empress of light battle reminds me a lot of an Undertale boss