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Normal Car Battery Voltage When Off. I think optima considers a battery to be basically discharged if it�s voltage is 10.5 or less. Remember that this is not a valid reading since the alternator is actively charging it. In that case, the voltage drops to 11.9 v. But if the battery reads over 15 volts or less than 13 volts, then there might be a problem with the voltage regulator, the wiring or the alternator.
3.7 Volts Battery Low and Full Level Indicator Ciruit From pinterest.com
So between 50f and 80f could have a 10% difference in charge state. How to test a car battery voltage. Measure the voltage after an overnight charge, and 1 hour after disconnecting the charger. To get a true voltage reading of the cars battery it is important to measure the voltage after the car has been sat for a period with the engine off, preferably overnight, this provides you with the “car battery open circuit voltage” or also know as the “resting voltage”. The standing unloaded battery voltage, after the vehicle has been off overnight without load, should be very close to 12.6 volts. If is is lower on the terminals you have a bad connection usually caused by.
A dead battery reads 11.9 volts under the same conditions.
The charging/system voltage should show 14.2 to 14.6 at all times above idle.maybe 13.9 at night, idling, with everything turned on. Remember that this is not a valid reading since the alternator is actively charging it. That’s the normal process of how an alternator works. The standing unloaded battery voltage, after the vehicle has been off overnight without load, should be very close to 12.6 volts. I think optima considers a battery to be basically discharged if it�s voltage is 10.5 or less. If the voltage is not 12.5+, the battery is dying.
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I would think that at 10.5 volts the battery probably wouldn�t crank the engine enough to start it. That voltage, with no load, is for a nearly discharged battery. There is a very big difference when a car battery drops even a small amount of voltage. When the engine is off the battery open circuit voltage is 12.9 volts. Remember that this is not a valid reading since the alternator is actively charging it.
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A guide for 12v car, commercial, leisure and marine batteries. I�ve been working on cars for 30 years, and this is how all of them have measured. The standing unloaded battery voltage, after the vehicle has been off overnight without load, should be very close to 12.6 volts. The charging/system voltage should show 14.2 to 14.6 at all times above idle.maybe 13.9 at night, idling, with everything turned on. It should read close to 12.6 volts when the car is off.
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To get a true voltage reading of the cars battery it is important to measure the voltage after the car has been sat for a period with the engine off, preferably overnight, this provides you with the “car battery open circuit voltage” or also know as the “resting voltage”. A fully charged battery reads 12.6 volts, disconnected and idle for over an hour. The actual open circuit voltage of a 100% charged battery is between 12.70v and 12.80v because each cell is approximately 2.13v. A 12 volt battery contains 6 x 2 volt cells but 12v is the nominal voltage. By the way, 14.2 v is not too high when charging.
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The standing unloaded battery voltage, after the vehicle has been off overnight without load, should be very close to 12.6 volts. You said you have a tender. A 12 volt battery contains 6 x 2 volt cells but 12v is the nominal voltage. When the car is running. The actual open circuit voltage of a 100% charged battery is between 12.70v and 12.80v because each cell is approximately 2.13v.
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The actual open circuit voltage of a 100% charged battery is between 12.70v and 12.80v because each cell is approximately 2.13v. If measured at this point, the battery reading you will get will be anywhere between 13.5 to 14.7 volts. That voltage, with no load, is for a nearly discharged battery. A guide for 12v car, commercial, leisure and marine batteries. To get a true voltage reading of the cars battery it is important to measure the voltage after the car has been sat for a period with the engine off, preferably overnight, this provides you with the “car battery open circuit voltage” or also know as the “resting voltage”.
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In that case, the voltage drops to 11.9 v. The standing unloaded battery voltage, after the vehicle has been off overnight without load, should be very close to 12.6 volts. Measure the voltage after an overnight charge, and 1 hour after disconnecting the charger. A fully charged car battery has 12.6 volts. Keep the trunk and battery compartment open when charging.
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I�ve been working on cars for 30 years, and this is how all of them have measured. If is is lower on the terminals you have a bad connection usually caused by. If the voltage is not 12.5+, the battery is dying. By the way, 14.2 v is not too high when charging. You can connect a charger whilst the battery is in the car.
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A 12 volt battery contains 6 x 2 volt cells but 12v is the nominal voltage. Remember that this is not a valid reading since the alternator is actively charging it. I�ve been working on cars for 30 years, and this is how all of them have measured. In that case, the voltage drops to 11.9 v. If you measure the voltage immediately after the end of a drive, it should be more like 13.2, and drop to 12.7 within a few minutes as the chemical reactions in the battery slow down and stop when you stop charging it.
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I would think that at 10.5 volts the battery probably wouldn�t crank the engine enough to start it. If you don’t have the proper diagnostic tools or multimeters to tell you the voltage, you can perform some electrical tests yourself. That voltage, with no load, is for a nearly discharged battery. So between 50f and 80f could have a 10% difference in charge state. This does not mean the battery is good and not having 12.6v does not mean it is bad, it just means the electrical system and battery should be checked.
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A guide for 12v car, commercial, leisure and marine batteries. I suspect you are getting 12.7 immediately after switching off the engine and it drops to 12.1 in the same time scale. When the car is off, the battery is still a 12v battery, and a 12v system in the car. Optima says that when the battery�s voltage reaches 10.5 volts that it needs charging. A fully charged car battery has 12.6 volts.
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Remember that this is not a valid reading since the alternator is actively charging it. Once the vehicle is running, the alternator will kick in and take over the task of powering the car while also recharging the battery. By the way, 14.2 v is not too high when charging. The actual open circuit voltage of a 100% charged battery is between 12.70v and 12.80v because each cell is approximately 2.13v. Disconnect your plug from the tender and connect it to a voltmeter instead.
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There is a very big difference when a car battery drops even a small amount of voltage. Is 14 volts good for a car battery? A fully charged battery reads 12.6 volts, disconnected and idle for over an hour. When the car is running. The ideal car battery voltage with the engine running is between 13.7 and 14.7v.
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So between 50f and 80f could have a 10% difference in charge state. Disconnect your plug from the tender and connect it to a voltmeter instead. Car battery voltage will change depending on its condition. I think optima considers a battery to be basically discharged if it�s voltage is 10.5 or less. The charging/system voltage should show 14.2 to 14.6 at all times above idle.maybe 13.9 at night, idling, with everything turned on.
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Obviously, a 60ma drain over 2 days shouldn�t drain a full volt off the battery. I�ve been working on cars for 30 years, and this is how all of them have measured. That will tell you if your car�s internal gauge is reporting accurately or not. Keep the trunk and battery compartment open when charging. Once the vehicle is running, the alternator will kick in and take over the task of powering the car while also recharging the battery.
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By the way, 14.2 v is not too high when charging. It should read close to 12.6 volts when the car is off. Secondly pulling voltage down to less than 50% remaining capacity permanently devalues the battery. This does not mean the battery is good and not having 12.6v does not mean it is bad, it just means the electrical system and battery should be checked. It outputs a higher voltage than the battery so that it charges the battery.
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When the engine is running and functioning correctly, the car battery will fluctuate between 13.7 and 14.7 volts. The charging/system voltage should show 14.2 to 14.6 at all times above idle.maybe 13.9 at night, idling, with everything turned on. The actual open circuit voltage of a 100% charged battery is between 12.70v and 12.80v because each cell is approximately 2.13v. When the engine is running and functioning correctly, the car battery will fluctuate between 13.7 and 14.7 volts. The standing unloaded battery voltage, after the vehicle has been off overnight without load, should be very close to 12.6 volts.
Source: pinterest.com
You said you have a tender. When the engine is off the battery open circuit voltage is 12.9 volts. The actual open circuit voltage of a 100% charged battery is between 12.70v and 12.80v because each cell is approximately 2.13v. If is is lower on the terminals you have a bad connection usually caused by. If the voltage is not 12.5+, the battery is dying.
Source: pinterest.com
But if the battery reads over 15 volts or less than 13 volts, then there might be a problem with the voltage regulator, the wiring or the alternator. When the car is off, the battery is still a 12v battery, and a 12v system in the car. So between 50f and 80f could have a 10% difference in charge state. If the voltage is not 12.5+, the battery is dying. So, the voltage has to be at least 12 for a car battery to have the functioning capacity.
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