Heavy duty battery charger: How to use these chargers for battery charging

About Heavy duty battery charger, You must have faced a situation when your engine stops working. There may be two possibilities; the battery ran down because you left the machine out in the cold, or you last used your device a long time ago. 

Whether your battery is completely drained or there is no battery in the machine, you will need a heavy-duty battery charger to replenish your battery. 

Let’s find out more about heavy-duty chargers in this blog post.

What is a heavy-duty charger?

Heavy-duty chargers are large-sized chargers for charging dead batteries in significantly less time than other standard chargers. 

You may have known these chargers by their names, like heavy-duty battery boosters, heavy-duty jump starters, or portable battery chargers. 

They vary in their shape and size depending on their amperage charging capabilities.

Heavy-duty battery chargers

Heavy-duty battery chargers

How to select a heavy-duty battery charger?

Consider different features before selecting a heavy-duty charger. 

Shapes and sizes: 

Batteries are of different shapes and sizes depending on the different types of engines, like cars, boats, recreational vehicles, or motorcycles; so do the battery chargers.

There are heavy-duty chargers which are large pieces of equipment that require movement on wheels. 

While choosing, you must ensure enough storage space for these chargers in your garage or your home.

You can also get portable battery chargers for the engine batteries. 

These small and compact equipment provide cranking power to jump-start the vehicles. 

The good part is that you can store it in your car trunk. Most roadside assistance crews use these units.


If the vehicle’s electrical system is 12V, you must use a 12V charger. 

Alternatively, if you have a 24V electrical system, you can use either of the 12V or 24 V chargers; mostly, all the electrical components of retail vehicles can handle a 12V power supply; thus, car and truck batteries must use a 12V jump starter.

Remember that if you use a booster with the wrong voltage, it may cause harm to your vehicle’s electrical components, like control modules and sensors.

Different jump starters for different vehicles:

Amperage charging capabilities:

While looking for amperage capabilities, you must look for two characteristics; cranking amps (power you need to start any engine in any weather except winter season) and peak amps (a jump starter’s maximum power output).

Choosing a heavy-duty charger will provide more amperage to the battery than a standard charger. 

Thus, these chargers can jump-start an automobile’s dead battery with their maximum cranking amps of 700, enough to provide power to any standard auto engine. 

Also, ensure you pick a jump starter with different charger settings to use with other batteries. 

If you use high amperage settings with small batteries, it will overcharge them leading to their permanent damage.


Heavy-duty chargers are commercial-grade chargers that can dig a hole in your pocket compared to a standard charger. 

To buy a heavy-duty charger, you will have to spend several hundred dollars which is next to impossible for a weekend mechanic.

However, most car repair shops maintain heavy-duty chargers because of their demand and long life. 

A few heavy-duty chargers also have multiple charging options that allow car professionals to charge numerous engines simultaneously.

Other features to consider:

Apart from all the above features, you must check whether the jump starters have a unique safety system, replaceable output fuse, or reverse polarity protection (RPP).

Jumper cables

Jumper cables

Six simple steps on how to use heavy-duty battery chargers?

Here are six simple, easy, and hassle-free steps to use a heavy-duty battery charger.

Pick the suitable battery charger:

  • Firstly, get an appropriate battery charger for your vehicle, as not all chargers can charge every model. If you want to charge a heavy-duty truck battery, get a charger suitable for the truck battery.
  • Once you get the charger, read the instruction manual that comes along with the charger. Read about the charger’s working and the safety precautions you must take. With this, you can use the charger properly and conveniently.

Remove both battery cables:

Before using the battery charger, remove cables from the car’s battery terminals.

Safety tips while removing cables:

  • Always remove the black or negative cable first and then the positive or red cable.
  • Ensure you have switched off the car’s engine before removing the cables.
  • Always wear insulated gloves and safety glasses while working.

Connect the charger to the battery:

  • When you remove the battery cables from the car’s battery, you are ready to connect the charger. Always start with the positive clamp of the jumper cable.
  • Connect the positive/red clamp of the booster cable to the battery’s positive port marked with a “+” sign. Next, connect the negative/black clamp to the battery’s negative port marked with a “-” sign.

Set the charger:

  • Once you connect both clamps to the battery, set the volts and amperes on the charger. You must set a low amperage for slow or trickle charge. Alternatively, set the charger on a high voltage and amperage if you want fast battery charging.
  • Fast charging may save some time, but slowly charging a battery helps to extend the battery life. Avoid fast charging if you have enough time to charge.

Plug in the charger and monitor:

Once setting all the connections, it’s time to plug in the charger. Ensure that the charger is working correctly with the monitor display. 

If everything is fine, let the charger charge the battery at its pace. 

Nowadays, battery chargers are automatic and automatically cut off once the battery gets fully charged.

Switch off and disconnect the charger:

Switch off the charger when the battery is full and unplug it. Disconnect both clamps with the negative one first. 

Now, your battery is fully charged and ready to use, so connect it to the vehicle’s terminals and start your ride.

Mechanic using booster chargers

Mechanic using booster chargers


Cables also play an essential role in heavy-duty battery chargers. Always get the high-quality cable to ensure long battery life.

Don’t know where to get them?

Contact Cloom as we manufacture superior-quality cable assemblies and wiring harnesses for vast industrial, commercial and residential applications.