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How to Charge Car Battery without a Charger – 2022

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How to Charge Car Battery without a Charger

As a regular driver or car owner, you must always ensure that your car battery gets charged. Well-maintained car batteries easily start a vehicle’s engine and improve its overall performance.

A dead car battery has to be one of the most prevalent car-related issues. However, a battery might become flat for various reasons, and there are a few unique ways to recharge it. In addition, most people are aware that the vehicle’s electrical system continually charges a car battery. Therefore, there’s no reason to remove the battery for any other reason.

So, if you don’t have a battery charger, how do you charge a car battery?

A car battery may be charged through a variety of methods without the need for a charger. These include connecting jump leads to a donor battery, utilizing a solar panel, connecting a power inverter to the mains, using another vehicle, or using a portable jump starter.

These are a few ways to charge a car battery without a charger. Let’s dive deeper into them!

Jump Start Your Vehicle

It means getting your battery up and running by using the power of another car’s battery via a jumper cable. You don’t need many tools or deep mechanical knowledge to do this job.

The most important thing is to select a good set of jumper wires; jumper wires usually come in a variety of lengths ranging from 10-20 feet, but don’t think that the longer the cable, the better the performance. In fact, it’s quite the opposite. 

Here are some pointers for effectively jump starting an automobile.

Tip 1: Ensure Cleanliness

Before connecting the jump leads, make sure the dead battery’s connections are clean and free of dirt and corrosion. Clean them with a wire brush or, if they’re nasty, a baking soda solution.

Tip 2: Assess The Jump Leads

Ensure that the jump leads are hefty enough to deliver enough current to restart the dead battery. They should be no thicker than six gauges (ideally four gauges) to guarantee that they can adequately carry the current and do not melt.

Tip 3: Run The Engine First

Run the donor car’s engine for at least 10 minutes before attempting to start the vehicle with a dead battery.

Solar Power

A solar panel or solar battery charger is another frequent means of charging an automobile battery. This charger is quite simple to construct and safe to use if you understand concepts such as voltage and amps. 

However, it’s not the best approach for charging a car battery, especially if it’s completely depleted.

Charging a wholly depleted battery can take up to 8 hours, depending on its size and the amount of power produced by the solar panel.

You must understand what you are doing if you decide to utilize solar power. You can’t simply connect the solar panels to the batteries and walk away. There’s quite a bit more to it.

You Can Use a Home Inverter

Using a home inverter to charge your car battery is not a well-known approach and requires additional equipment. Therefore, you should not use this method regularly, but you can do it sometimes.

Inverters are electrical devices that convert alternating current (AC) from a wall outlet to direct current (DC) supplied by a car battery. Here’s how to use this approach.

Step 1: Unplug The Inverter

Before making any connections, unplug the inverter from the power supply. By connecting the negative port of the battery to the black wire of the inverter, and the positive port to the red port of the inverter’s positive port.

Step 2: Double-Check Connections

Double-check the connections to ensure they are as described above, plug the inverter into a power outlet.

Step 3: This Is Optional

The high power supply provided by inverters may charge the battery in 1.5 to 3 hours; however, this approach should only be utilized when you are in a hurry.

Portable Car Jump Starter

Okay, so the title may be a little deceiving. Technically, the jump starter is not used to charge the battery; instead, it initiates the process. So as the engine starts, the alternator takes over the process of charging the battery.

Here are some pointers for utilizing a jump starter.

  • Before you begin, check the battery’s condition. Using the jump starter to start the engine is pointless if the battery is old or has failed. Before you start, use a multimeter to ensure that the battery is in excellent working order.
  • Disconnect or turn off any auxiliary electrical systems in the car, including lighting, music equipment, phone chargers, and air conditioning. These are a drain on the battery and may prevent the engine from starting after the jump start.
  • Before connecting the jump starter, ensure that the existing battery connections are clean and free of corrosion.
  • Always attach the jump starter when the ignition gets switched off to avoid damaging the vehicle’s electronics

These are some of the questions asked regarding car battery charging below.

Frequently Asked Questions  (FAQs)

How do I use a wall outlet to charge a car battery?

Yes, inverters are used to convert AC electricity to DC current that is compatible with vehicle batteries.

Is it possible to recharge an entirely dead battery?

Yes, an entirely dead battery may be recharged in various methods, including jump-starting your car, utilizing chargers, or plugging it into a power outlet with an inverter.

Is it possible to charge a battery in a car?

Yes, simply plugging the charger into the car and letting it do its work; depending on the capacity and technology of the charger, this may take some time.

How much time does it take to recharge a dead car battery?

The desired outcome determines the charging speed because fast charging can damage the battery cells. The best-case scenario is long-term charging on low amps, with a standard car charger providing 4-15 amps, but for maintenance usage for a dead battery 2-4 amps, it will take 24 hours to charge fully.


You should always be prepared for circumstances such as a flat or dead battery as it could cause you costly problems. It’s important to carry charging equipment with you wherever you go, and be careful when dealing with batteries because making short circuit wiring connections may result in system failure and burnt chips.

So, if you are unsure about something or have any worries about your approach, you should seek guidance from some skilled mechanics or go to a professional garage.

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