A portable car battery charger can be a very vital thing to the car owner. No matter where you are, you can recharge your car battery instantly. Just think that you are in the middle of your way in your car and the battery dies. Maybe you can get an emergency mechanic to charge it up, but it will take a lot of time and cost money. However, if you have a battery charger that you can carry in your car, you don’t have to worry about such situations. Just charge it up and start your journey again.

But, these not just buying one and using happily. If you don’t choose a good charger, the situation will be as same as not having one. So, for your guidance for choosing the best portable car charger, here we will discuss the bests that you can have. 

Our top 3 pick



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Battery Tender Junior 12V, 1.25A Battery Charger, and Maintainer

Battery Tender Plus Charger and Maintainer

NOCO GENIUS1, 1-Amp Fully-Automatic Smart Charger



Ac charging is the most common charging method for electric vehicles with a plug. You can use this charging method if your car is in the parking spots where the car will stay for a long time. When the electric vehicle is plugged into a normal charge point, converting inside the vehicle the power moves into the car battery. Charging speeds depend on the output power of the charge point as well as the convertor’s capabilities to convert the power to DC. You can find the AC chargers ranged between 16A (3.7 kWh) and 63A (43 kWh). It is lower in cost.

On the other hand, for fast charging, the DC charging method is used widely. The principle of DC charging is to convert the power before it enters the vehicle. As soon as the power is converted, it bypasses the car’s converter conversion and goes directly into the car battery. But a DC installation needs a lot of power from (around 125 A). This makes it costly and resulting in higher tariffs for charging. This type of charger is mostly found along highways, rather than at home or business locations.


They are easy to move and can be used anywhere. They are quite light and can be easily moved from place to place without much effort. You can take them in your car easily anywhere you go. Once they are fully charged, you can use them as you need.

You can recharge your car battery anywhere you need. No matter where you are if your car battery needs charging, you can do it instantly and very easily. Just plug and forget about it.

They help you with your emergencies. If you are in the middle of your way and you suddenly your car battery goes low, you can use them to get rid of such situations.

They are affordable. A portable car battery charger is not costly. They are available at affordable prices. You can purchase it without spending much money.

They can also charge other devices. Some car battery chargers come with additional charging modes and ports for other smaller accessories and different battery types. USB ports, for example, are common and perfect for keeping devices charged on the go.


Charger type according to your battery type

A car battery can be of different types. They can be a maintenance-free, wet cell, AGM, gel cell, or VRLA (valve-regulated lead-acid). One charger should work for all types except for the gel cell. Some of the gel cell chargers may work well with the other battery types.

So, first, know your battery type and then choose the charger according to it.


As you are purchasing a battery charger that is portability, you should check for it while buying one. The best battery chargers focus on keeping their products small and light which makes them portable and easy to use. You can carry them anywhere in your car and use them when you need them. So, take a look at the weight and size of the charger and inspect how much portable the charger is.

Power specifications

Car battery chargers need to adapt to the different types of car batteries it may encounter. Generally, different batteries will have different levels of amps they require to effectively work. Chargers with the ability to detect the required amps and distribute the necessary voltage make the charging process safer and easier. Some chargers also have to charge phases that can read and adapt to the battery’s state and adjust the charging settings accordingly. So, buy a charger that can provide enough power to charge your car battery properly.


Since most car battery chargers see use outside or in garages, a basic level of exterior protection can keep the charger in a good condition for a long period of time. Protection from water and dust is an important feature, often denoted by the IP rating system that measures how resistant something is to these elements. Basic heat protection also goes a long way towards protecting the interior components of a charger. 


If a battery charger is not easy to use, it definitely not going to help you as much as you expected. Not every user has the time or the interest to learn the workings of batteries and their chargers. So, you need to choose a charger that is easy to use and easily you can find or use the other features.

Additional features

If you want to get more out of a car battery charger, extra features and accessories are a must. Things like small device charging ports, built-in radios, and rapid-charging functionality all allow you to get more use out of the charger and more value for your dollar. Even basic add-ons like an LCD screen led indicators or a waterproof or spark-proof exterior help with usability and durability.

Charge Time

The average charge time of a car battery charger will vary, depending on the charger itself and the car battery. On average, most chargers take between two and ten hours to charge a battery completely. Small, portable chargers tend to take longer so larger garage-only models may be a better purchase if you want the fastest charge times. 


Modern battery chargers take safety standards very seriously and include at least a few safety features on each model to protect users and their batteries from potentially bad accidents.

Best portable car battery

Top pick 1

Battery Tender Junior 12V, 1.25A Battery Charger, and Maintainer

Product Description: The battery tender junior battery charger is the best portable car battery charger that you can find in the market. It can automatically charge your car, motorcycle, or boat battery until it’s fully charged. After full charging, it switches to float/maintenance voltage for safe storage without overcharging the battery. It has an input voltage of 120 V AC at 60 Hz and an output voltage of 12 Volts DC at 1.25 amps. The battery is compatible with lead-acid, flooded, and sealed maintenance-free batteries (AGM and gel cell) and ideal for use in long term storage to provide and maintain an optimal charge. You will not find such a smart charger and maintainer that is also spark-proof during lead connection and automatically detects reverse polarity to ensure a correct, locked-in connection before providing power.

  • Portability
  • Easy to use
  • Safety features
  • Value for money


The charger can maintain to charge your car battery with 12V and 750mA unit. Very safe to use because it will not overcharge the battery. As it comes with a 12-foot cord, you can cover enough distance if needed. It is lightweight and compact that ensures it operates everywhere. You can even use it in small storage spaces. It also extends battery life and provides spark-proof during lead connection and automatically detects reverse polarity to ensure a correct, locked-in connection before providing power. It doesn’t come with any extra unnecessary features and no extra technology to malfunction.


Easy to use.
Safe charging.
Spark proof compatible with different batteries.
Features float mode.


lacks some of the charging versatility features.

2) Battery Tender Plus Charger and Maintainer


This is another Tender battery charger on our list. Like the first one, this battery also comes with float mode. The 1.25 amp charger provides a full charge to the Powersports battery and then switches automatically to float mode to maintain proper voltage levels without overcharging the battery. It provides very fast charging and for its low maintenance design, you will find it very easy to use even in small storage spaces. The Powersports charger and maintainer charges faster than any 3 amp charger available.

The charger is compatible with lead-acid, flooded, and sealed maintenance-free batteries (AGM and gel cell) and ideal for use in long term storage to provide and maintain an optimal charge. It has two colors LED light indicator that indicates the state of the charge. Also, the battery is very safe and secure to use. It is spark-proof and detects reverse polarity.

  • Very fast charging.
  • Spark proof.
  • Comes with float mode.
  • Compatible with different types of battery.
  • Easy to use for its low maintenance design.
  • Clamps could be larger.
  • Troublesome to use on a flat battery

3) NOCO GENIUS1, 1-Amp Fully-Automatic Smart Charger

The third choice in our list is the NOCO Genius1. It ensures 35% smaller and delivers 35% more power than the NOCO 750 and this is not just a battery charger. This also features as battery maintainer, trickle charger, and battery desulfator.

The design of this in such a way that you can use it both for 6-volt and 12-volt lead-acid automotive, marine, and deep-cycle batteries and compatible with flooded, gel, AGM, and maintenance-free, plus lithium-ion batteries. You can enjoy precision charging as it comes with an integrated thermal sensor, which can detect the ambient temperature and alters the charge to eliminate over-charging in hot climates and under-charging in cold climates.

Also, it can be used to charge dead batteries. You can charge your battery even it is as low as 1-volt. You can use the all-new force mode that allows you to take control and manually begin charging dead batteries down to zero volts. The battery maintainer feature ensures you a safe and worry-free this best portable car battery.

  • Safe charging.
  • Battery maintainer.
  • Easy to use.
  • Compatible for everyday use.
  • Compatible with all types of vehicles.
  • Does not charge a flat battery.
  • Does not work well in extremely cold temperatures.


Q: How long does it take to charge a car battery with a charger?

A: Generally, a charger takes 24 hours to charge a car battery fully. If we charge our car battery with a 2 amp car battery charger, it will take a reasonably long time. It may take up to 24 hours to reach an acceptable charge.

Q: Can you charge a dead car battery?

A: Yes, a dead car battery can be charged. If your car battery is below 12 volts, you should use a dedicated charger. Nowadays, charging devices are designed to safely restore a dead battery to full charge. Most of the time, you don’t even have to remove the battery from your vehicle.

Q: How does a car battery charger work?

A: A simple charger works by supplying a constant DC or pulsed DC power source to a battery being charged. They do not alter their output based on charging time or the charge on the battery. So, a simple charger is inexpensive, but there are tradeoffs.

Q: Is it OK to start a car with a battery charger on it?

A: Yes. It won’t hurt the charger, the battery, or the car. Getting enough charge into a flat battery can take time before you try to start it though, and that depends on how flat the battery is and how fast the charger charges.

Q: Can you leave a car battery charger on overnight?

A: Even though there is no risk of overcharging with the use of a high-quality charger, the battery should not remain connected to the charger for more than 24 hours. Even after a deep discharge, some chargers enable at least partial reconditioning of the battery.

Final word

Now, it’s your time to make a choice. Follow the instruction and make a better decision to have a safe and worry-free trip in your beloved car.

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