what voltage should a battery read

I won't pretend that I can tell you what else could have been at fault for the "stuck on" condition, or even that I know for certain it wasn't just as you said. Any reading of voltage below 9.5 volts, or if the battery holds a good record for a while and steadily drops, or even when it falls instantly to 0 volts, then it means there is a problem, and the battery should be replaced due to its low capacity. Although electronic thermostats do (usually, anyway) rely on their own power source to run their internals (including a switch that determines whether the furnace will be told to run), the actual messenger that switches it on is typically a ~5V line which is supplied by a transformer in the furnace. Plug the red lead into the 10amp port that is the opposite port used for testing voltage as described above. We'll assume you're ok with this, but you can opt-out if you wish. 5. 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 … The first test we would talk about is the static battery voltage test; you should do this to know the state of charge of your battery. 1 year ago. If the battery is old or has bad resistance, it could still be bad and show a high voltage reading of 7 to 9 volts. I will attach some pictures of measurements in action. Notice the voltage reading on the voltmeter. 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. This is the method used for non-sealed lead acid batteries. Crank up the overall engine and with a “voltmeter” to check voltage. 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. When the multimeter reads 12.8 volts, then your battery should not be charged any further, because it is fully charged. Step 3. The voltage of an unloaded battery will not change significantly as it dies. but... a NiCad battery is rated for 1.2V FULLY CHARGED. If you are interested in reviewing the same tips as we read, then go to battery man guide page to find out more! Notice the voltage reading on the voltmeter. Check up on the battery during this process as it should have the voltage values of about around within or above a 9.6 in voltage rating. 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. This electronics tip has to deal with checking common alkaline AA/AAA batteries or AA/AAA rechargeable batteries for proper voltage with a voltmeter. Battery Voltage vs Temperature. You're talking about amperage--two different things. I claim no liability what-so-ever! Why Is My Car Battery Voltage High And Is It Dangerous? To be somewhat accurate, the battery should be in that condition for an hour or two before taking a measurement, while for a more accurate measurement you should wait 6 hours up to 24 hours. car battery voltage, ZenMacrame Theme I think a safer method would be to use the multimeter as a means of testing for amperage as you describe but using a 220ohm resistor in series with the battery under test so the meter would for 9V battery show 4 milliamps. 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. This website uses cookies to improve your experience while you navigate through the website. Bad batteries are called open-cell batteries. Required fields are marked *. If it is below 7 volts, you can be pretty sure that the battery is not much good anymore. Bear in mind that when a battery goes down to 12.2V it's actually only 50% charged, and below 12V it's … 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. If the reading is more than 1.3V for alkaline battery (not rechargeable battery) then the battery still … 7 years ago Testing a battery with a multimeter will only tell you what the voltage of an UNLOADED cell is. Instructions on how to use a multimeter are out of scope of this Instructable, you can find some information here: http://www.ladyada.net/learn/multimeter/, Participated in the Electronics Tips and Tricks. A reading of 12.10 volts means that it is halfway With 11.90 … © 2020 Jafty Interactive Web Development |, How to test a 9 volt Battery with a Multimeter. 8. Whats people lookup in this blog: What Voltage Should My Motorcycle Battery Read A perfect voltage with the engine running is between 13.7 and 14.7V. Under a load. 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! 2. Your email address will not be published. The voltage reading of 12.4 volts will indicate that the battery is only 75 percent charged. Fully charged automotive batteries should measure at 12.6 volts or above. If it reads 12.6 volts, the battery is just attaining a fully charged state. 6. 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.

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