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A car battery voltage chart shows the voltage levels of a battery at different stages of charging and discharging. The chart typically includes voltage ranges for different battery states, such as fully charged, charged, and discharged.
The voltage of a car battery should be between 12.2 to 12.6 volts when the engine is turned off. A fully charged car battery voltage falls between 13.7 and 14.7 volts with the engine running. With the battery charge at 75%, the voltage can drop to 12.4 volts.
Charging a car battery can take 4-8 hours with a 12-volt battery charger. You can recharge your car battery at home, parked in a well-ventilated garage. Charging a battery can take most of the day or all night.
Here’s a car battery voltage chart that correlates a battery’s voltage to its life, to help display how many volts are really needed to keep your car running happily.
Fortunately doing so is super easy. Read on to see how to use a battery charger to recharge or maintain the charge of your car's battery in five simple steps—with accompanying video...
Understanding the readings on a car battery voltage chart is crucial for diagnosing the health of your battery. Here’s a simplified chart to help you: 12.6 volts or above: Your battery is healthy and fully charged. 12.4 – 12.5 volts: Your battery is partially charged at about 75-90%.
A reading of 12.65-12.77 volts means your battery has a full charge. 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. 11.75-11.89 volts means your battery is dead.
Most car batteries require a voltage between 12 and 14 volts to charge properly. However, it is important to note that the voltage output will vary depending on the type of charger used. For example, a trickle charger may only output 2-6 volts, while a jump starter may output up to 20 volts.
To check your car’s battery condition, you’ll need a battery tester, like a voltmeter or multimeter. The multimeter has two probes for measuring the battery voltage and load: red and black. The red probe is for contact on the positive terminal, and the black probe is for the negative terminal.
12.6 volts or more: A voltage reading of over 12.6 volts indicates that your battery is fully charged and in good condition, so there is nothing to worry about. 12.5 volts: A reading of 12.5 volts shows that your battery is healthy and 90% charged.