Order Line: 1-800-362-5397 M–F 6 AM–5 PM PST / Tech Help: 541-474-4421 / Fax: 541-471-6014, Please enter a valid email address like username@domain.com. Check Battery Voltage and State of Charge It is important that you first check the battery plus the charging system output (alternator). Dd Excellent article. Should contain only letters, numbers, and (' - .)! And that was in 2008, 8 years ago. If your battery is sitting at 10.7 volts that leads me to believe the wrong charger is being used, or the charger or charging system is malfunctioning. A fully charged battery should read 12.6 volts with the engine off. Engine running and preferably with all peripherals off (lights, fans, etc.) (Sorry about that Oat1957 but you are wrong.) However, if you jumped and still no crank, hear the starter how it … The cenntenials lasted 4 1/2 years, like clockwork. TECH A 6v battery after a charging cycle should be around 6.6 volts. A fully charged car battery voltage (without being plugged into an external device) ranges from 13.7 to 14.7 volts. I think the date code is 2004 or 05. Email Email address should be formatted user@domain.com (will not be published). Had a few close calls where I thought they would be changed… so far so good. The open circuit voltage of a typical lead-acid battery is 13.5 volts, 2.25 volts per cell at full charge. This would yield a total battery voltage of 13.8 volts when disconnected from the charger. Email Address - will not be published Email address should be formatted user@domain.com, Rate Article 1 2 3 4 5. And starts fine. But it won't reliably start the car. As you know by now, the battery is responsible for producing the power to start the car. A voltage of 12.3 indicates about 50% charge. 11.75-11.89 volts means your battery is dead. What Is the Normal Charge for a Car Battery? They are wired in series and parallel, making a 12 volt system. I ran a 100 foot length of 10 gauge from the batteries directly to the radio. It is perfectly normal, in fact, healthy for this to happen. 1.75 volts per cell at full discharge. © 1997-2021 BatteryStuff.com LLC. If it now still turns slow or in the morning, battery needs replaced if drops below 12 volts. Q: At what voltage should a car battery be replaced? James Cunningham I have a 6v battery in my quad and i charged it up and its reading 10.7v, when i turn on the key it goes down to 2.3v is the battery stuffed or do i have a short somewhere? Any load on the battery causes the battery voltage to fall to a low level - but it recovers back to 12.8 volts when the load is removed. The only way to rest assured that your battery will not fail you is to troubleshoot the battery and find the reason for the failure. JJ I have had good luck with Motorcraft. wli98122, When testing the voltages for battery/alternator test directly on clean battery terminals when possible. It’s not a matter of voltage but of capacity and power output. All Lead acid batteries (Gel, AGM, Flooded, Drycell, etc) are made up of a series of 2.2 volt cells that are bridged together in series to reach their final desired voltage. BatteryStuff Knowledge Base Article answering the common question why a 12 volt battery can read 13 volts. This removes any surface charge. Should contain only letters, numbers, and (' - .)! I have 10 Trojan T 105 6 volt batteries. 13.7 V is OK when engine running and alternator putting out charge. Lights off. Each of the 6 cells in a 12 volt battery actually holds up to 2.2 volts. It is perfectly normal, in fact, healthy for this to happen. Testing a car battery using your digital multimeter Testing the voltage. Fully batteries should measure at 12.6 volts or above. Any readings below 11.9 volts will indicate a fully discharged battery, and damage may have occurred to the storage device. Maybe even try n start it. The danger in simply jump-starting a dead battery or placing it on a battery charger is that the battery may not be able to maintain a charge. I’m surprised it lasted 84 mths. The voltage of the battery itself with the negative terminal disconnected was 13.7. 6 x 2.2 = 13.2 When I am told that a charging system is only delivering less than optimal voltage my first instinct is to question the accuracy of the volt meter being used to test the circuit. The battery will still charge at 13.4 volts but it won’t get above 80% charged. I will be getting another one. RSS. A reading of 12.65-12.77 volts means your battery has a full charge. The ideal car battery voltage range will provide you with a relevant interval according to which you can measure precisely what the voltage says about the battery’s current charge. Car battery will not start car . It may charge, but at the first super-consumer attached, it will weak out. Each of the 6 cells in a 12 volt battery actually holds up to 2.2 volts. The one in my old 91 Sable lasted 7 or 8 years. if you get a boost run car for about an hour or so, take for a drive on highway, but do not turn off till home again, Battery should be charged by now,check voltage of battery with volt meter, should show 14.2-14.8 volts, this shows alternator OK.. The prorated warranty is for 100 mths. Posted 5 years ago Radio is a Yaesu Ftdx 1200 requiring 13.8 volts plus or minus 10%. A 75% charge is about 12.4 volts, 50% is about 12.2 Volts and if your 12-volt battery reads 12.0 volts it is only about 25% charged. A voltage around 11.7 shows battery only charged to 10% of full capacity. I charged it & its lasted another 2 mths. A perfect voltage with the engine running is between 13.7 and 14.7V. A fully charged battery should have about 12 volts ready to go. The day following a cold snap it wouldn’t start. For instance, a 6 volt battery will have 3 cells (3 x2.2= 6.6 volts), a 12v battery for a motorcycle for a motorcycle will have 6 cells (6 x2.2=13.2 volts) and so on. This is by far the longest lasting battery we’ve ever had. Then when it goes back to 14 volts the lights go bright. I charged it, it now reads 12.54. and they are 5 years old. 12.45-12.54 volts means you have a 75% charge, 12.24-12.29 is 50% charged, and 11.99-12.06 volts is 25% charged. BatteryStuff Tech If the 8 volt charger won‘t do it, try using a 6 volt charger to bring them up to the point where the 8 volt charger can ‘read them’ and turn on. All Rights Reserved. Battery Basics: A Layman's Guide to Batteries. Turn off car , immediately re=start and car wll start without quick start device. Joan Very helpful information and well-written for a non-technical college grad. Here are the particulars. Registered: Aug-05. Using the Voltage setting on the multimeter, first touch the probes to the battery terminals to determine the voltage of the battery. Turn engine off, headlamps on for 5 mins. Thank you, For Questions and Tech Support, please submit your question with our, Read Knowledge Base in RSS news reader with. History. If your car is slow to start and the engine is being too slow to crank and turn over, this is a sign of a battery issue that can enhance the car’s performance issues. That 2.2 volts is the fully charged, straight off the charger number. To perform a voltage drop test of the cables and terminals, touch one probe to the battery … Can they be saved? Follow comments in RSS news reader with A meter reading of 12.2 volts or 12.0 volts will indicate a charge rate of 50 percent and 25 percent, respectively. Testing the Battery. The actual resting voltage, or the voltage a battery will settle at 12-24 hours after being removed from the charger, is closer to 2.1 volts per cell, or about 6.4 volts for a 6v battery, and 12.7 volts for a 12v battery. As the battery discharges, the voltage drops. It should be between 13.8 and 14.2 ideally. The car will start and is charging 14 volts then for no apparent reason will drop to 11 volts then back up to 14 volts. The Bosch batteries lasted 2 1/2 years like clockwork. 13.4 volts is a little bit on the low side. However, when the engine is running, this charge should measure at 13.7 to 14.7 volts. If the battery isn’t fully charged, it will diminish to 12.4V at 75%, 12V when it’s only … A battery can read 12 VDC, even 13+ VDC and however have not enough amps for the strong twist the starter demands, or just too weak to maintain the charge for a starter. When charged, the battery shows a voltage of about 12.8 volts (measured with a voltneter) More when it has just been charged - about 13.8 volts. You say the battery is good and charged, if you measure voltage at the battery (cold) it should be 12.4-12.6+ to be good (maybe have load tested). Thank you. Although a battery is called '12 volt' battery, its voltage varies from about 12. We respect your rights to privacy and will not share your email information with anyone ever. In all my years of using many types of batteries in my RC hobbies, it was commonly accepted that the maximum voltage is 2.3 volts per cell (in a lead-acid type battery). Tim I have 6 8volt batteries that are dead. Battery is stuffed. The motorcraft XBT66-650 has a date code of Dec. 2007. Comparing it to the ideal car battery voltage range will help determine the battery’s condition. Check voltage while cranking, below 9.5 volts. The battery posts could be corroded the fluid could be low in one or more cell or the battery could just be bad. A specific gravity of 1.269 means that the battery … 6 x 2.2 = 13.2 I thought it may be a faulty gauge but when I take it out at night when it drops down to 11 volts the lights begins to fade. My charger won‘t charge them because they are below 20 %. Electrolyte gravity voltage test. Full Name Should contain only letters, numbers, and (' - .)! yes, it's 12V, while my car was parked it was showing 12.93 to be exact, and again, my engine was off, i remember two weeks ago that i checked my battery with only my engine ON and everything off and it was showing 13.7v. Order Line: 1-800-362-5397 M–F 6 AM–5 PM PST / Tech Help: 541-474-4421 / Fax: 541-471-6014, Email address should be formatted user@domain.com. Battery check shows 13+ volts-- Using a quick start device starts car . These numbers assume 100% healthy cells, and may vary a bit lower for older batteries. On some car models, the voltage of the battery can be checked at the dashboard but that won’t help you know how good is your battery since the voltage reading in the dashboard actually shows the power coming from the alternator and not the battery. Guilty As Charged Blog Post answering the common question why a 12 volt battery can read 13 volts. Email address should be formatted user@domain.com. It will drop to 12.4 volts when the charge is 75% and 12 volts when it is at 25%. For $20 more I will stick with the motorcraft. Slow Start . Voltage when the car is running The voltage, when the engine is running, should be in the range of 13.5-14.7 volts. The graph below shows a state of charge estimation on a battery at rest - not under any load. A car alternator needs to be putting out at least 13-14 volts (ideally between 13.8 and 14.2 volts) to effectively charge a 12 volt car battery.If the alternator is putting out too much voltage (15+ volts), it is likely your battery acid will boil over out of the battery. Battery terminal voltage of 12.6 volts (green) shows 100% charge. Either way if it is dropping that low after charge it is most likely bad, but the reason failure could be a result of using the wrong charge on the battery, or the charging system malfunction and cooking the battery. These numbers assume 100% healthy cells, and may vary a bit lower for older batteries. All Rights Reserved. That said, if you don't have a multimeter to tell you the voltage of your car's battery, then you can do a test of your electrical system. This is the method used for non-sealed lead acid batteries. All Lead acid batteries (Gel, AGM, Flooded, Drycell, etc) are made up of a series of 2.2 volt cells that are bridged together in series to reach their final desired voltage. you should see around 13.5 to 14.2 volts. if thats with the engine running that is fine as your alt will vary on output depending on load. This voltage varies due to the electrical load the car … The ones in a 99 diesel Ford have been there since I got it. Then again last nite, it wouldn’t start the car. They are 225 amp hour @ 20 hrs. Again, what a battery freshly disconnected from charging should read. The reading of 12.1 means the battery is run down a bit or is bad. For instance, a 6 volt battery will have 3 cells(3 x2.2= 6.6 volts), a 12 volt battery will have 6 cells(6 x2.2=13.2 volts) and so on.That 2.2 volts is the fully charged, straight off the charger number. A perfectly charged cell has 2.2V, hence a brand new battery should read 13.2V when fully charged. We respect your rights to privacy and will not share your email information with anyone ever. If there is a dead or weak cell, normal charging voltage can’t be achieved on a battery … Battery Myth | Why is My 12 Volt Battery Reading as 13 Volts? With the engine off, you should get a reading of 12.6 volts. The actual resting voltage, or the voltage a battery will settle at 12-24 hours after being removed from the charger, is closer to 2.1 volts per cell, or about 6.4 volts for a 6v battery, and 12.7 volts for a 12v battery. © 1997-2021 BatteryStuff.com LLC. Name Should contain only letters, numbers, and (' - .)! The rule of thumb that states 12.6 volts equals a fully charged battery and 12.2 volts means it is 25 percent charged, is starting to change with some modern batteries and charging systems. The problem with trying to determine battery condition with voltage is two fold, first is a condition called surface charge. If it has been years since the last replacement, you might notice the car battery shows 13 volts. It read 11.86. When your car is running the cars alternator is charging the battery, this is why you should see a higher voltage. With this method, a hydrometer measures battery voltage. Turn on the headlights if they come on with normal brightness it’s possible the no crank problem is not the battery. Posted on Friday, January 20, 2006 - 17:40 GMT.
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