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How to Charge a Car Battery Without a Charger

February 28, 2024 | Victor Lukasso

A battery is essential to a car as it supplies the needed current and feeds the starter motor, which starts the engine. This means a vehicle’s electrical system wouldn’t be functional if the car battery died.

A dead car battery is one of the most common problems associated with a car; sometimes, it could happen at the wrong place or time. Situations like this usually strike you when you are in haste, and you might be far away from the charger.

However, I will teach you how to charge a car battery without a charger in this article. This will help you through those embarrassing moments when your car battery dies without giving you previous notice.

How to Charge a Car Battery Without a Charger

As mentioned, having a dead battery means you cannot start your vehicle like usual. Likewise, all the electrical systems connected to the car would be dead.

So, the following methods can help you awaken your car battery without a charger.

1. Jump-start your car

This is a simple method to get your battery up and working with power from another storm through a jumper cable. This does not require many tools or professional mechanical knowledge. Instead, all that is needed is a good set of jumper wires, ranging from 10-20 feet, which varies in length.

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However, always take precautionary measures while jump-starting your car to ensure your safety and those around you.

You can check out our article > What is the Proper Battery Cable Connection When Jumping Two Automotive Batteries?

Ensure that you read your car’s user manual to know if there is an additional step in jumping start your vehicle, and be careful of electric shocks while handling the jumper wires and metal clamps once they are connected to the car. If possible, wear protective glass and gloves

Note: The longer the cable the more the energy loss, so shorter cables that are equally thick are preferable.

2. The use of a Solar Panel

This is not the best way to charge a car battery, especially if the battery is dead. It requires tools like voltage and amps. There are a few different ways to achieve this. Still, for your safety, I recommend using a solar charge controller to block reverse currents and prevent the battery from overcharging. The size of the solar panel needed and how long it will take to charge the battery depends on the size of your car battery.

3. Charging a car battery with a home inverter wall outlet.

This method is not well known and may need you to get some more equipment. However, it is not a method you should use frequently. As we all know, an inverter is an electrical device that converts alternate current to direct current. To achieve this goal, you have to take the following steps.

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Step 1: Before setting up this connection, please disconnect the inverter from the power supply, then connect the black wire of the inverter to the negative port of the battery and the red wire of the inverter to the positive port.

Step 2: Check the connection the second time to ensure it is well connected, as stated above, then plug the inverter into the power outlet.

Step 3: The battery may charge for 2 to 3 hours from the Same high power supply from inverters. However, this method should only be used when you are in haste.

4. The use of Battery Isolators

These battery isolators are well-known among RV drivers and regular campers. When installed, a battery isolator allows you to charge a car battery using the electrical power from the vehicle’s alternator. This works by sending part of the electrical power that the alternator has generated to the secondary battery.

However, this method is not the best for a completely dead battery as the current produced may not be comparable to that of a car charger.

5. Leave The Battery to Charge in Another Vehicle

This method can only be possible if you can access another vehicle with a battery similar to the one you want to charge.

However, before a swap between these two batteries is made, there are a few things that you need to bear in mind and ensure.

  • Ensure that both vehicles have similar mAh ratings, shapes, and sizes.
  • Also, ensure that the battery has been donated and doesn’t need to be registered with the ECU before it begins to charge appropriately.
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After ensuring the abovementioned things, fix the car’s battery while ensuring that the engine and all the auxiliary electrics are switched off. Once the battery is set and the engine is on and running, you can ensure the battery gets charged slowly and fully by taking the vehicle for a long drive.

Frequently Asked Questions

How long does it take to recharge a dead car battery?

The speed at which charging occurs in twenty-four hours depends on the result you wish to obtain. Typically, maintenance usage for dead batteries of 2-4 amperes will take 24 hours to charge fully.

Can a completely dead battery be recharged?

Yes, a completely dead battery can be recharged using a charger or any of the above methods if the charge isn’t available.

Can a car battery be charged through the cigarette lighter?

Yes, charging the battery through a cigarette lighter socket is possible. To do this, the car’s circuitry will require having the lighter socket live and setting the ignition switch to “accessories.”

Can you charge a car from a socket?

Yes, a car can be charged using a domestic three-pin socket. However, it is best assessed using a dedicated home EV charger, which delivers around 7kW of power.

Can you jump-start a car with a wall outlet?

No, you cannot jump-start a car using a wall outlet because cars run using a 12-volt DC supply, while your house uses an AC supply. So, using AC on a DC battery could result in severe damage.

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Meet Victor Lukasso, the owner of V. Auto Basics. Through this blog, Victor Provides Insights on the latest tips, maintenance, repair, and techniques in the automotive world.