It’s either a goner or it has been deep cycled, and a battery can only be deep-cycled a limited number of times before it is indeed dead. 12-volt batteries supply useful energy only through a limited range — from over 14 volts (when fully charged and unrested) down to 10.5 volts in use/under load (when lights dim, pumps groan and TV pictures get small).
What voltage is required to charge a 12 volt gel battery . Remembering that the battery voltage will read lower in colder weather and higher in hotter weather, you simply… Subtract 0.024 volts for every ten degrees F, if the temperature is below 80 degrees F. Actually, if a battery’s resting voltage is only 12.0 to 12.1 it means only 20 to 25% of its useful energy remains. Otherwise voltage values can fluctuate based on whether the battery is being charged or discharged. This is not a resting voltage, it is an under-load voltage, and the battery has been under a constant 5.25A load now for nearly five and a half hours straight.
The lowest limit is 10.5 volts (used in testing) and obviously unsatisfactory in practical use. To get a good reading of the voltage of a battery, it is best that you go through it with a voltmeter, which can be in purchase from different auto-part shops as well as different retail stores or specialty shop like Batteries Plus. The terminal voltage of a battery cell depends on the chemicals and materials used in its construction, and not on its physical size. With the engine off, you should get a reading of 12.6 volts. Car Battery Voltage Chart. On December 3, 2011 at 9:10pm. Note: The figures are based on open circuit readings.
Needs a space, as does “series.Let”. I put together the following battery state of charge chart which indicates the state-of-charge (percent) as it relates to battery voltage or specific gravity. … IAN. 12 volts is the standard automotive battery in today’s vehicle and each of the battery has 6 cells with a voltage of 2.1. With experience, one can accurately determine state of charge using a voltmeter. On September 19, 2012 at 2:23am. With the engine off, you should get a reading of 12.6 volts. A fully charged car battery voltage should be 12.6v or above, this is with the engine off. Voltages and Specific Gravity are listed for a 6-volt or 12-volt battery, and battery banks of 24 and 48 volts. Compare this to the chart from above at 12.30V that our customer was using as a resting voltage chart. Man Man wrote: “Italso” - sounds like an Italian battery company. When a car drops, for instance, from 12.6 to 12.0, there will be 75% difference.
The actual open circuit voltage of a 100% charged battery is between 12.70v and 12.80v because each cell is approximately 2.13v: OCV: 12.60v to 12.80v*
This is intended as a guide only as the voltage reading will be effected by the battery age, technology and temperature.
The chart is listed below.
The table below shows the voltage and approximate state of charge for each type of battery. A perfect voltage with the engine running is between 13.7 and 14.7V. 12 Volt Lead Acid Battery State of Charge (SOC) vs. Voltage while battery is under charge Battery State of Charge (SOC) in Percent (%) Battery Voltage in VDC 11.5 12.0 12.5 13.0 13.5 14.0 14.5 15.0 15.5 16.0 16.5 10 20 30 40 50 60 70 80 90 100 110 120 Rest C/5 C/10 C/20 C/40 There is a very big difference when a car battery drops even a small amount of voltage. SOC can be determined by measuring the voltage; this is most accurate when the battery has been removed from a load for at least 6 hours, preferably 24 hours. Battery voltage state of charge table. As a battery is charged the indicated voltage increases and, as discharging occurs, the indicated voltage decreases. In this method you use the standard State of Charge versus Volts Chart. The above chart gives an indication of what the voltage should be at different states of charge and operating conditions. A perfect voltage with the engine running is between 13.7 and 14.7V. SOC can be determined by measuring the voltage; this is most accurate when the battery has been removed from a load for at least 6 hours, preferably 24 hours. But first, a few important notes and caveats… Man Man wrote: And “(OCV)attained”.
No 12-volt battery will remain at over 14 volts for more than seconds unless it’s being charged. 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. mark wik wrote: love your site. Rechargeable NiCd (nickel cadmium) and NiMH (nickel metal hydride) typically output 1.25 volts per cell.
For example, primary (non-rechargeable) alkaline batteries have a nominal voltage of 1.5 volts. Otherwise voltage values can fluctuate based on whether the battery is being charged or discharged. Here is a chart from MK Battery showing different levels of charge for flooded lead-acid and sealed batteries – open circuit voltage.