Does Revving the Engine Charge the Battery Faster?

Whether revving the engine charges the battery is quite a common question in the automotive world.

This article explains the relationship between revving the engine and its effect on the battery by breaking it down into several key-related areas for a better understanding.

Some of the areas discussed in this piece include;

  • The different compartments of the battery charging system and their functioning.
  • When is it best to rev your engine?
  • Whether jump-starting the battery helps in its charging?
  • The safe revving of your engine to charge the car battery.

Does revving the engine charge your battery?

Yes, revving the engine helps charge your battery, though only when the battery is at a significantly discharged state. Manufacturers design the car’s in a way to ensure the battery maintains the charge throughout.

Lead-acid batteries only need the amps from the alternator when the car is idle. The only exception is when the battery is in a state of low charge.

At this point, the battery receives more amperage than when the alternator is idle.

Revving the engine charges the battery faster as the alternator increases its amperage.

When you rev the engine, it hastens the operation of the alternator and, in return, aids in charging the battery.

To best understand how this happens, you need to know the anatomy and functioning of the car charging system.

Structure of a car’s charging system

The car’s charging system has three major components the alternator, battery, and voltage regulator.

In addition, there are other supporting parts such as the crankshaft, rotor, and alternator belt that play vital roles in the system performance.

Wearing out of any elements mentioned above may have significant effects on the functionality of the car.

Problems with the charging system will impact the amount of current received by these components rendering them dysfunctional.

How does the charging system work?

The charging system generates current with the coordination of all the components.

The process starts with the crankshaft connected to the engine. Running the motor turns the crankshaft, and revving the motor increases the turning speed.

The motion moves the alternator belt, which links to the rotor.

The rotating rotor enables the generation of current by the alternator, after which it passes through the voltage regulator.

The regulator divides power between the electrical components and the battery for charging.

The connection of the charging system is like a single unit working through a network in an organized motion.

With all the components in good condition, the system efficiency is remarkable. However, if one of the components is faulty, it can crash the entire system due to its interconnection.

The system’s working also explains why revving up the engine will result in a substantial amount of current produced by the alternator. With more current to allocate, a high amount will channel to the battery for faster charging.

How revving increases the battery’s charging rate

Revving a car’s engine makes the crankshaft run faster, thus increasing the motion of the alternator belt.

The movement rotates the rotor in the alternator faster to generate more power and consequently more current for the automotive and electrical battery components.

The charging system controls the amount of current allocated for channeling in the alternator.

This system supplies the necessary power for the car’s essential electrical parts, and the remaining current used to recharge the battery.

Does revving the engine charge your battery when jumping?

The short answer is yes, it does. When a battery needs jumping, it means the level of charge is very low. At this point, the battery can receive high amps or charge from the alternator.

An engaged alternator higher than the idle speed means that it has attained its maximum output potential; hence, the battery charges faster.

Revving the engine makes the alternator operate quickly and consistently, engaging it higher than the idle speed.

Rev the engine between 1200 and 2000 rpm for 5 min with the jumper cables still connected. This move ensures that the battery is warm to make it whicker.

Moreover, it aids in adding a surface charge to a low-charged battery.

A surface charge elevates the battery’s voltage, making it ready to receive high amps from the alternator.

Charge the battery after revving the engine by taking the car for a ride. Driving for a minimum of 30 minutes continues to charge the battery, ensuring that you need no other jump-start.

Does revving the engine damage the car?

You have to be very cautious when revving the engine to charge the battery as it may hurt the car. Damage occurs if the vehicle isn’t on neutral or the engine is cold.

Revving the motor in either state can subject it to excessive wear.

Moreover, it is risky to rev the engine frequently. Ensuring the engine’s temperature does not spike is vital in preventing any damage from the revving process.

You can warm the engine before revving to make it charge faster and minimize the danger involved.

Unfortunately, if you start with a dead battery, it may be impossible to warm the engine. In such a case, be careful to avoid damaging the battery.

What is the Safest Way to Rev the Engine?

You can safely rev your engine with the following steps

Step 1:

Start your car and have it on neutral mode. It may be impossible to do this with a dead car battery that needs a jump start. In that case, first, jump-start the car to start the engine and immediately put it in neutral.

Step 2:

Allow the engine to idle for a minute after you start the engine. This step allows the engine oil to circulate properly. Circulation of oil in the engine while revving prevents damage to the engine.

Step 3:

It is now time to rev your car. Press down on the accelerator pedal till the needle on the tachometer moves to the red end of the gauge, which shows your car has attained safe maximum engine speed, per the manufacturer’s recommendations.

Step 4:

After you finish revving your car, slowly let go of the pressure on the accelerator pedal till the engine is back to idling.


As stated, revving the engine aids in the fast charge of the battery. With the following guidelines and tips provided in the article, you are sure to complete the revving process without incurring any risks or damages.

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