Updated at: 23-07-2022 - By: Lucas

A vehicle’s battery is one of the parts that must be replaced at a predetermined interval since it will eventually fail. However, drivers who only drive their car a few times a week or for short distances are more likely to need to replace the batteries due of battery discharge issues.

Because the alternator is the primary power source for the battery and the entire electrical system of the car, the quick answer is yes. When the engine is running, the battery will get a constant flow of electricity from the alternator.

Maintaining working temperatures for oil and coolant as well as the overall functional status of the engine are all procedures that take place while a vehicle is idling.

How alternator helps the car battery to charge while idling?

Does Idling A Car Charge The Battery-2

The automobile industry is divided on whether or not the alternator can charge the battery sufficiently even when running at idle. The idea that the alternator only charges the battery when the automobile is moving is a total fabrication. The alternator’s ability to supply power does not rely on the vehicle’s wheels moving.

In the event that you’re often stuck in traffic, what if your car is idling rather than moving?

Unless there is an issue with the engine, the vehicle will stop.

The fundamentals of creating energy in an internal combustion engine can be summarized as follows. The car battery turns on a starter motor, often known as an electric motor, to provide the initial crankshaft revolution that transfers torque to the wheels.

As soon as the engine cranks, the battery’s starting current can be as high as 300 400 Amperes.

The free tail part of the crankshaft is commonly used to hang a variety of belt drives in autos. Smaller amounts of torque are utilized to rotate an alternator shaft in an automobile. The alternator rotor and the engine crankshaft spin in unison.

In an automobile alternator, a winding is located on both the rotor (which rotates) and the stator (which is stationary). AC is converted to DC, and the resultant current is then delivered to the vehicle’s battery for charging.

Because the crankshaft rotation is sufficient to generate current for the vehicle’s battery and other parts that require it, the technique does not require the use of the vehicle’s wheels.

Do alternators generate enough energy for the battery?

In order for the batteries and other consumables to function correctly, alternators are intended to provide as much energy as necessary. In most cases, the driver will be alerted by a red rectangular icon with + and – marks on the dashboard of their automobile if there is an issue with the charging process.

The alternator can handle the whole power draw of the vehicle without the assistance of a battery. The battery will be drained if certain thresholds are crossed, hence reducing the risk of overheating.

For a brief period of time when the engine is started, this dashboard indicator will illuminate. A malfunctioning alternator is usually the cause of a DC supply problem, as long as the sign does not go away. In order to fix the electrical system, a diagnostic must be done.

Charging the battery when idling in winter

Does Idling A Car Charge The Battery-3

It doesn’t matter what time of year it is to recharge the battery. It is important to note that battery charging is slower at lower temperatures, but this will improve as the engine warms up.

Frequent short journeys deplete the battery more quickly in the winter since there isn’t enough current flowing through the system. This leads to a progressive exhaustion of the battery and should be avoided throughout the winter. Driving 10 to 15 minutes longer is all that is necessary.

If the majority of consumers start generating their own power, it will be impossible to replenish the grid. Additionally, the battery requires less electricity in the winter because of the lower temperature.


Among its many functions, the alternator powers the vehicle’s lights, radio, fog lights, security systems, and other high-demand electrical components including the car’s alarm system and central locking system.

It doesn’t matter whether the engine is running or not when the alternator charges the battery; as long as both the alternator and the battery are in excellent operating order, charging will go smoothly.

No more charge is taken from the battery than what it has already used (for example, to start the vehicle). If you constantly recharge the battery, it will overheat and burst into flames.

If the alternator, the battery, or a consumer is put on the automobile, the charging procedure will not be affected until there is a problem with these components.

An poorly fitted battery can cause an engine to idle and a malfunctioning battery to fail to charge, which is commonly the case. Make sure to check out those customers.

Other auto enthusiasts will want to install additional electrical consumers in their vehicles, which will necessitate a larger battery and a more powerful alternator to handle the additional weight.

Varying car brands have different idle settings specified by the manufacturers. Indicators that are lower than expected are a warning that systems and processes are out of whack.

In fact, a car that sits for an extended period of time wastes its battery’s energy more faster than one that is regularly driven, and there are plenty of customers who can quickly deplete the power source.