Best Car Battery Chargers Review 2021

Car Battery Charger – Buying Guide, Opinions and Analysis


At some point in your life with your car, you may have experienced a problem trying to start it and notice how the engine does not react after turning the key. One of the most common failures is that the battery has discharged, so having a charger for your car battery is a recommended way to always be protected against this inconvenience. Among the most popular alternatives is the Giaride SPFP18V7.5W , a solar panel charger that provides a voltage of 12V and 7.5W, suitable for use with a car, motorcycle and even a boat. On the other hand, if you are looking for a 22,000 mAh car battery jump starter with two USB outputs, the BuTure BR200 could be your best alternative.


Shopping guide


One of the main fears of drivers is running out of battery in the middle of a long trip, so it is advisable to always carry a charger that can save you in those uncomfortable moments. With this in mind, the market offers all kinds of options, including battery chargers. To help you choose one of these devices, we have prepared a useful guide to buying the best car battery charger, which will be of great help, especially if you are looking for the cheapest model.



The first step you must take, when you want to buy a device of this type, is to consider your budget and ask yourself how much the device costs, so that you can know if it is within the range of money you plan to invest in it.

However, you should not worry, since the market offers a wide variety of models with all kinds of prices. But, it is important that you bear in mind that, sometimes, cheap is expensive, so if you choose a low-cost charger, you could run the risk of buying a defective one or one that does not meet your real needs.

For this reason, many experts suggest that, when making your purchase, price is not the main requirement.


Battery Type

Although many users do not have this concept in mind, the reality is that there are multiple types of battery and, although most chargers work with different types of battery, you need to make sure that it is compatible with the one in your vehicle. In this way, you can be sure that you have chosen the right model for you.



One of the most important aspects for anyone looking for a new car charger is the versatility that the device will give, especially if you need it to use a wide variety of vehicles.

Whether you are the owner of a mechanical workshop or a person with various types of means of transport, acquiring a battery charger compatible with cars, motorcycles, trucks, jet skis and boats is the best option.

While if you are interested in buying a charger only for your car, a simple and cheaper model would be enough.



This is the most important technical requirement that you should take into account when making any comparison of car battery chargers, since it will tell you the output voltage and, therefore, the type of battery that can work with it.

Most of the chargers that you can find on the market have an average of 12V, so they are suitable, for the most part, for compact vehicles. However, you can also find models for very specific uses and that have an appropriate voltage level for your needs.

To choose correctly, you only need to know the voltage of your vehicle’s battery, but if you are interested in a multifunctional model, it is recommended that you validate if it can be regulated.



When choosing a new car battery charger, amperage is another factor that you should be aware of, since, in addition to other benefits, it will determine the speed with which the battery will charge. However, keep in mind that a high upload speed is not always a good thing, as it may not be as effective.

Therefore, most experts indicate that it is more advisable to choose a charger with automatic detection of amperage as well as voltage. These are known as smart chargers and stand out for being very easy to use, since they do not require configuration by users.



Finally, before making your decision, do not forget to look at the level of protection and security that the device offers. The car battery charger you choose must have characteristics that prevent the possible damage that a battery can suffer, such as overcharges, short circuits, overheating, reverse polarity, among others.

On the other hand, keep in mind that it may be the case that you need to use it outdoors and even under extreme weather conditions, so it is suggested that the device comply with aspects such as, for example, the IP65 standard.

In addition, you should not forget to check the type of insulation that the charging clamps have, since, if it is of low quality, it could produce sparks that could damage or compromise the battery.




Frequently asked questions


Q1: How to use a car battery charger?

Before using a charger without much knowledge, it is necessary that you have invested the necessary time to carefully read the instruction manual. This way you make sure not to misuse the charger.

Confirm that the cables you are using are properly connected to the battery terminals and press the charge button. In case your model is automatic, you will not have to perform any other steps.


Q2: How to charge a car battery with charger?

The first step you should do is clean the battery terminals or posts. For this you can use a mixture of water with sodium bicarbonate to help eliminate the corrosion that accumulates on the terminals.

Continue placing the charger as far away as its cable allows so that you can protect it. Continue setting the proper voltage on your charger, in case your model is manual. If it has a “smart” automatic charger, the device will make its own adjustments and adapt to each situation.

Connect the clamp for positive current with the corresponding cable from the charger and the second clamp to the ground port. Finally, plug the charger into a power outlet and leave it plugged in until it is fully charged.


Q3: How to know if a car battery charger works?

If you have doubts that your car battery charger is working correctly, what you have to do is follow the following simple steps:

First connect the charger to a power outlet and disconnect the battery you need to charge. Then, with the use of a voltmeter, you will be able to know if there is a little electricity in the device.

Connect the red and black wires, placing the first in the positive terminal, and the second in the negative terminal. By performing this step, you can check the amount of charge the battery is receiving.

Keep in mind that a negative reading indicates that the charger is not working properly, so it is best to replace it.


Q4: What voltage does a car battery charger give?

The voltage given by a car battery charger should be the same as the voltage indicated by your car battery. For example, if the indicated voltage is 12V, it is important that the charger works with the same voltage. Likewise, if the voltage is 24V, the charger should have the same.


Q5: Why does my car battery charger get hot?

The fact that your battery charger heats up while in operation is normal to some extent, however, if the charger reaches a very high temperature, it is advisable to see if there is a short that may be causing overheating.

For these cases, battery chargers incorporate a protection system for the circuits, which usually prevents shorts, overvoltage, overheating and overcharging, among other possible and common failures.


Q6: How long does the power last in a car battery charger?

Car battery chargers tend to retain energy for a short time, some being a little longer and others a little less. This depends on the type of charger you have purchased.

To avoid discharging during a winter break, which is the same as an unused season, some chargers have technology that allows them to conserve energy for longer.


Q7: What maintenance does a car battery charger require?

It is very important to worry about properly maintaining our electrical appliances from time to time. However, with regard to car battery chargers, it is important to know that, depending on your model, maintenance can be very low or practically null.

There are some models on the market, such as solar panel chargers, which require practically no maintenance process. Therefore, just by wiping it with a dry and clean cloth, you can remove the accumulation of dust that it may have on its surface.

On the other hand, conventional car battery chargers may require more detailed maintenance. So a damp cloth is usually used to clean all exposed parts of the appliance.

Finally, it is highly recommended to check if the charger provides correct operation, using a voltmeter with which you can check the proper flow of energy.



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