what voltage should a battery read
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Reply Now, push the starter button, and watch what the voltage drops to. 12.6-Volts is considered “idea,” with experts and researches in agreement as to how and why this can leave a consistent, steady amount of flow currents in the battery that can help it preserve voltage for longer durations on time. This battery is bad. I claim no liability what-so-ever! To test the output voltage of a typical 9 volt battery, simply set your volt meter to DC current and set the voltage at 20 volts or the closest setting to it. 1 year ago A reading of 12.10 volts means that it is halfway With 11.90 … Try to use batteries that have same amount of energy stored in them. Probably not for long, but it did work. 12.4-Volts is considered “really good” as it has enough voltage above the standard and leaves just enough room for some extra storage. UNLESS you're one of those weirdos like me who is concerned about things like not being wasteful, not polluting, caring for the environment, caring about other people and stuff like that. You're talking about amperage--two different things. car battery voltage, ZenMacrame Theme Anything below that temperature is in the category fit for cold weather or temperatures and causes the battery to have too much buildup internally that it will have a default lower voltage, starting from high to getting lower and lower – this is not bad per se, but can be troubling to some people. Obviously, if it’s closer to 0.05 or less, then it doesn’t have much life. Required fields are marked *. Because the CAPACITY of the failed battery has diminished. Share it with us! Check Car Battery Charging Voltage. 5 years ago But instead... let's draw 1/10 of it's capacity... 200mA. Battery Voltage vs Temperature. Applying the red lead to the positive or smaller round terminal of the battery and the black lead to the negative larger round lead of the battery should get you a reading of between 8 and 9.5 volts on a decent 9 volt battery with some life in it. Yup, you pretty much can when it comes to answering for both of these scenarios. In fact, I had to turn the light off. With the battery in front of you, put the red probe to battery's nipple (+) and the black probe to the battery's flat side (-). 7. If you're getting a reading with a minus in front of it (-12.6 rather than 12.6) you've got the probes the wrong way round! Stay above that voltage, and you and your batteries will live long healthy lives. The next step is to adjust the multimeter to a direct current of 20-volt range and connect the battery terminals positive to positive and negative to negative, while the battery is still connected with your vehicle engine, just like you did for the static battery volt test. When i finished i was putting everything back in the box and noticed i had forgotten to put the batteries in the multimeter but it still worked. The alternator should be standard a not elevated or in a rising state. Testing a battery with a multimeter will only tell you what the voltage of an UNLOADED cell is. Your email address will not be published. No, not for most electronic devices. 1 year ago. What Voltage Should My Motorcycle Battery Read, Click to share on Twitter (Opens in new window), Click to share on Facebook (Opens in new window). I think he is talking about testing for voltage while the battery is under load. on Introduction, The article was pretty clear that this was for testing an alkaline AA or AAA. These cookies will be stored in your browser only with your consent. What Should A Car Battery Voltage Be When Driving? So, around 9.6 to around 10 in voltage rating is relatively good when it comes the voltage need to help start your car battery – that … 4. Tip : do not use old and new batteries in the same device at the same time. Let's take the example of a AA battery... if it has a 2000mAh capacity, that means that it can support a load of 2000 mA for 1 hour... or 1000 mA for 2 hours. You also have the option to opt-out of these cookies. I think it is an oft repeated, unsubstantiated tidbit that is as helpful as the tip, wait 30 minutes after eating before swimming. Required fields are marked *. Crank up the overall engine and with a “voltmeter” to check voltage. + Alkaline battery If it reads 12.6 volts, the battery is just attaining a fully charged state. 5. Any cookies that may not be particularly necessary for the website to function and is used specifically to collect user personal data via analytics, ads, other embedded contents are termed as non-necessary cookies. 2. A battery is at fifty to seventy-five percent at around 12.2 to around 12.4 (ideal). Reply I am sharing some of the more important lessons on battery testing here for my own reference and others to learn by. For example I have couple 50 ohms laying around, which should draw a much less current, will it show different result from 8 ohms? Doesn't the meter need batteries to check voltage? Set to this, put the red lead in the middle hole and the black in the bottom. To those who stumble upon this, this is why you need to test the battery under load. 13.5 to 14.5 or more volts at idle should be produced by a charging system that operates normally. Basic facts :  This would hardly discharge the battery at all. 2. Also, the test is for determining whether the cell was depleted or not, not whether it had malfunctioned. We'll assume you're ok with this, but you can opt-out if you wish. Why Is My Car Battery Voltage High And Is It Dangerous? Knowing that you can use the multimeter to check your 12-volt battery is useful knowledge, but the key question is “how do you check your 12-volt battery with the multimeter?”. Why? You should read 4.0 mA (milliamp) for a AA or AAA battery. Given the temperature conditions of your battery at rest or without recharging, the sign of “12” in terms of voltage is not enough, and it is most likely just borderline to having a decrease once temperature fluctuations hit. Another issue with the 1.5 volt battery... a NON-RECHARGABLE battery is rated for 1.5v fully charged. To test the battery, turn on your voltmeter, put the voltmeter on DCV and make sure that it is far above the battery voltage, on most voltmeters there is a setting "20" in the DCV area, so switch your voltmeter to that setting. With the engine off, you should get a reading of 12.6 volts. Or both. Just use a 1/2 watt (or greater) resistor as a load and you can get a true estimate of whether the battery is good or bad. Save my name, email, and website in this browser for the next time I comment. The next test is the starting load test; it is more straightforward than the static, you would carry this out to know if your battery needs a replacement or not. The ONLY way to test a battery is to estimate the current draw scenario, and 200mA is a good base case scenario, and test it with an equivalent load. The proper voltage for AA/AAA alkaline battery is 1.5V With those readings after several days resting, I'd suspect measurement issues, but you might try applying a small load for a short time. To eliminate this possibility, follow these steps carefully and only if your multimeter has a 10amp setting. As we've discussed the resting voltage should ideally be no lower than 12.6V. The indicator is in the green area, which means this battery is still good. Plug the red lead into the 10amp port that is the opposite port used for testing voltage as described above. 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The thermostat's power just has to decide to close a little circuit on its board, which doesn't usually take much juice. Still, we are talking about deciding whether to dispose of an inexpensive battery or to replace it with a new one. This last test we would discuss is necessary to test your battery’s charging system. Hi, is the resistance going to make any difference during the test? I will attach some pictures of measurements in action. “Testing” the load can be done in a good number of ways, but the most common one involves the use of a “voltmeter,” which is a device that hooks up to the connector posts of your battery to accurately measure the given voltage of the attached battery. Step 4. Although it appeared a "low battery" was your problem, it could be that the fresh battery, (or the some aspect of the battery change) just masked or reset a different problem. Turn off properly the engine system, especially during the beginning. With 11.90 your battery is low and in desperate need of a boost. 2 months ago, If the voltages are to different then you'll drive a reverse current through the week battery and it could fail physically. First up, you can always perform what is known as “testing the load,” which is simply an indication of how much available voltage (or “the juice”) a given battery has during the time it is without being under utility for a startup. If you don’t want to risk it, don’t. Any readings below 11.9 volts will indicate a fully discharged battery, and damage may have occurred to … But when it reads 12.4 volts, the battery has attained a 75% charge level, and it could still be charged further, there would be no danger. Bear in mind that when a battery goes down to 12.2V it's actually only 50% charged, and below 12V it's … Read the battery test scale. A weak or dead smoke alarm battery in a fire, or a dim flashlight bulb during a blackout, can be downright dangerous. When I tested a brand new cheap 9 volt battery, it had 0.5 amps, so a good brand name battery would probably be much higher, but this range gives you a pretty good idea of the working range of a nine volt battery because even the battery that held only 0.05 amps would still power a 12 volt rated bank of of 3 LED lights. Also necessary for continuity checks. Set the voltage selector to the 1.5V setting (1.5 volts) and touch the red probe to the (+) end (with the nub) and the black probe to the (-) end of 1.5-volt batteries. Now bring your engine to about 3,000 RPM, then check the voltage reading on your multimeter and compare it to the specification on the owner’s manual. But in case you're not too familiar with HVAC and are just guessing, I want to give you a heads-up that the problem could be something else and you may want to be on the lookout. I plugged the cables into my analog multimeter and touched the leads to the ends of the batteries and measured the voltage. (function() { Out of these cookies, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities of the website. I am not an HVAC pro or guru; my observations are not definitive. As askjerry indicated, testing a battery (of any chemistry) unloaded is pretty much a useless endeavor. But it is important to take safety precautions associated with handling lead batteries and also wear protection for your eyes. "Tip : do not use old and new batt..." I hear that tip all the time, but have never once seen an explanation accompany it.

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