Car Battery Voltage Temperature Chart
Car Battery Voltage Temperature Chart . The ideal car battery voltage with the engine running is between 13.7 and 14.7v. View the most popular hydrometer on amzn. OEM Battery Life AcuraZine Acura Enthusiast Community from acurazine.com If the voltmeter shows a voltage reading of 12.2 volts then the battery is approximately 50% charged. A fully charged car battery voltage should be 12.6v or above, this is with the engine off. The actual open circuit voltage of a 100% charged battery is between 12.70v and 12.80v because each cell is approximately 2.13v.