Proactively testing it (or making sure your mechanic does) twice a year will help reduce your chances of failure. The ‘State Of Charge’ (SOC) of a battery is a measurement of how much energy is remaining (percent). Use our Find a Retailer for a location near you to get a free battery test. 60% 36.72 The gravity on that one varies constantly, and I have to add water more often. A perfect voltage with the engine running is between 13.7 and 14.7V. Chuck did an excellent job. Copyright 2020 Leaf Group Ltd. / Leaf Group Media, Battery Charging the Lead Acid Battery. After recharging the battery, test it to find out if it is capable of holding a charge. 13.5 to 14.5 or more volts at idle should be produced by a charging system that operates normally. A voltage value of 12.7 volts and above indicates a 100 percent charged battery. Its power drops from 100% to 25%. John from Italy. The chart is listed below. Baby those batteries for longest life. It’s important to test your battery and electrical system regularly, not just when it’s starting to show signs of weakness. When the engine is running, this measurement should be 13.7 to 14.7 volts. A voltage value of 12.7 volts and above indicates a 100 percent charged battery. Both advisors were friendly and knowledgeable. The meters on the other hand can get way off. However I averaged all of them together to come up with a chart which represents what I believe to be a good GENERAL indication. This is called the “open-cell” or “resting” voltage of the battery. A battery fully charged has a reading of about 12.6 volts. The batteries are 3 years old costco interstates. A typical 12-volt lead-acid battery must be taken to approximately 14.2-14.4 VDC before it is fully charged. A surface charge occurs through the charging process and can give a false result to the following test. It’s common occurance, especially in winter, when batteries have to work even harder to get you to where you want to go. This is helpful information, thanks for gathering all the data! Dim or no headlights at all, check on the battery voltage and charging output. Any readings below 11.9 volts will indicate a fully discharged battery, and damage may have occurred to the storage device. In case the battery has a reading of 12.4 from the voltmeter, it means it is low (discharged) and should be recharged. I mainly use this system for 12 volt water pumps,a few LED’s and cfl lights and occasionally power tools. Connect the black lead to the negative terminal. The Trojan sounds like it is getting old, and needs more frequent watering and equalizing to keep it functioning. Some were slightly different from each-other with regards to their SOC values. If you know your exact battery, you might find related voltage information on their website. document.write(new Date().getFullYear()) If the battery is fully charged (according to the battery charger) but the voltage is 12.5 or less, the battery … Even though it was night time, I felt safe. The dedicated tester is simply connected to the battery terminals and the voltage can be read. With the multimeter, the device is configured to measure voltage up to 20 volts. When a car drops, for instance, from 12.6 to 12.0, there will be 75% difference. Running a few appliances just to test it. How Many Volts Is A 12 Volt Battery Fully Charged, Then? That’s the specific gravity tool the article talks about. The charging process emits a highly flammable gas that can be ignited by any open flames. This indicates the charge of your battery. The test is done with the engine off. Consider your car battery charged at 12.4 volts or higher and discharged at 12.39 volts or less. Only 12-volt, lead acid, batteries can be recharged by an electrical battery charging device. Read the value in DC volts on the face of the meter. Over 25,000 topics, from beginner tips to technical guides, Check cars for recalls, common issues & maintenance costs, Hand-picked, community-rated professionals, Our mechanics make house calls in over 2,000 cities, Explore nationwide job opportunities for automotive technicians, Trusted mechanics, rated by thousands of happy car owners, Fleet maintenance with certified mobile mechanics, The statements expressed above are only for informational purposes and should be independently verified. Turn on the headlights if they come on with normal brightness it’s possible the no crank problem is not the battery. The open top or maintainable battery allows the user to check and add fluid to the battery. victor from NIGERIA, Hi I’m Tommy from Indian wells golf resort in California, i have a fleet of 160, they get used alot in season, now its summer we are slow, i have them in rotation, always have, when a certain section stays in for 2 days the battery percentage on the gps units will be 100%, a day or 2 later drops down to 85 to 80% or lower because they haven’t been used, is that good for the battery?

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