How to Test a Car Battery?

Multimeter or voltmeter is sufficient to test the car battery.

What is the Task of Car Battery?

The car battery provides the necessary electric current to power all electrical components in your vehicle.For example, you've heard or seen cars or services that reinforce cars that run out of battery. Without the battery, as you may have noticed, your car will not start.

car battery
Components for Car Hood

Any engine we use has to depend on batteries to start the first turns, then they will return on their own.Your car's battery has a responsibility to start the entire car engine and send electricity to the starter to start the flywheel connected to the crankshaft to move the engine pistons.Some older cars in the 1950s or 60s had manual crank handles on their front bumpers, drivers had to go in front of cars to use the hand crank, a few powerful hand cranks were needed to power the engines with manpower. We leave behind such a time and energy-intensive technology thanks to batteries.

car battery
Giving the Engine the First Movement

Testing the Car's Battery

car battery

To measure the voltage of the car battery, we need to take the multimeter to the DC Voltage option, then connect the Red cable to the battery + boxbu, the black cable to the battery box. Reversing the connections between the multimeter and the battery during voltage measurement only changes the direction of the value you will see on the screen.

When the car is closed

If the voltage is around 12V in battery measurement when the engine and ignition are off, we can say that your battery is healthy for a first look. If it's under 12V or above, your battery isn't working properly.

While The Car Is Running

When you start the car, i.e. the engine, it is normal to have a certain amount of voltage drop, for example, 11V, because when the car is first running, the starter motor that tries to give the first movement to the car's engine draws about 300A current, this high load on the battery causes a short-term voltage drop.

While The Car Is Running

When the car is idling properly, the car's alternator begins to charge the battery, so the voltage rises in the car's battery, for example, 14V. The reason this voltage is too much is because the alternator outputs with a little more voltage to charge the battery.