![]() However, if possible, it is highly recommended to try to find the charging voltage-temperature compensation coefficient of the battery You own, or even better, a voltage-temperature chart or graph. Lead-acid battery charging voltage-temperature compensation/correction coefficient varies from -3mV/☌/cell to -5mV/☌/cell, with the average value being -4mV/☌/cell. If the battery voltage is below 13.6-13.7 volts, the battery is being recharged by the alternator - again, this is with the engine being turned ON and the battery is being charged. When the engine is turned ON, the alternator charges the battery and its voltage should be in the 13.7 to 14.7 volts range. Lead-acid batteries are the most common car batteries, but they also differ and can be wet/flooded batteries, enhanced wet/flooded batteries, Absorbent Glass Mat (AGM) batteries, enhanced AGM batteries, Gel-Cell batteries, batteries with pure lead plates, batteries with calcium plates (calcium-lead plates), etc.Īll these battery types have slightly different voltages when they are fully charged, semi-charged, or fully discharged, have slightly different temperature correction/compensation coefficients, etc. Car Battery Frequently Asked Questions (FAQ).The exact battery voltage depends on the engine being turned On or Off and the battery's charge condition, age, load, temperature, etc. While car batteries feature a nominal voltage of 12 volts, in real life, this voltage can be anywhere from just a few volts (or even 0 volts!) to almost or even slightly over 15 volts. ![]() The car battery provides energy not only for cranking the engine but it also powers a broad range of devices that may be turned on when the engine is off, even when the car is locked, like GPS units, alarms, and other security systems, multimedia devices, lights, etc. Car Battery Testing & Voltage - How Many Volts is a Car Battery?
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