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Diesel Truck Battery Chargers and Maintainers: Buyers Guide

Battery charger for diesel truck

Diesel truck batteries lose their power due to numerous reasons. A great way to prevent your diesel truck battery from dying is to use a battery charger. Because diesel trucks have two batteries to successfully start the engine, you will want to find the charger that would allow dual battery charging. Also, you should know that compared to gas engines, diesel engine batteries require more power.

This article will cover the best battery chargers for a diesel truck.

Best Diesel Truck Battery Charger

The best diesel truck battery charger is the NOCO GENIUS2X4. It is very powerful, and has the ability to power up to four car batteries at a time.

Name Voltage Charging current Battery capacity Weight Review


best overall

6 V / 12 V 8 A 160 Ah 3.9 lbs / 1.8 kg Review
Schumacher DSR124


most powerful

6 V / 12 V / 24 V 15A Not applicable 70 lbs / 31.8 kg Review



6V / 12V 10 A 230 Ah 3.33 lbs / 1.5 kg Review

Best diesel truck battery charger reviews

The NOCO Genius2x4 is the best diesel truck battery charger, while Schumacher is the most powerful, and the NOCO GENIUS 10 is the cheapest.

NOCO GENIUS2X4 – best overall


The multi-bank NOCO GENIUS2X4 battery charger, maintainer, and desulfator will help you take care of four batteries at the same time covering a wide range of your needs.

It goes above and beyond what you would expect from a battery charger. It can charge both 6V and 12V batteries. This charger is also very small and compact which allows it to be stored just about anywhere.

It also has a lot of additional features that improve the charging experience. For example, it has a built in zero over charge ability that finishes charging the battery after it reaches full strength. This means you can keep in plugged in without ruining the battery.

There is also a sensor built into the charger that is able to detect the outside temperature. This prevents it from overcharging in hot conditions and undercharging in cold conditions.

Along with charging batteries, it also has the capability to jump start a dead battery. It is able to generate up to 8 amps when charging a battery. Along with diesel truck batteries, it can also charge batteries from just about any other vehicle. It can also charge lawn mower batteries.


You can buy this diesel truck battery charger for around $200 on amazon.

Being a multifunctional and powerful unit, the NOCO GENIUS 5 is the best AGM battery charger that offers the utmost functionality and flawless performance.

Key specs

Voltage, V : 6/12

Charging current, A : 8

Battery capacity, Ah : 160

Output power, W : 120

Weight, lbs/kg : 3.9 / 1.8

Dimensions, inches: 7 x 5 x 11


Can be used for both 6V and 12V batteries

Has a zero overcharge system which lets you keep the battery charging as long as you want


  • Kind of expensive
  • Doesn’t support 24V batteries

Schumacher DSR124 – most powerful

Schumacher DSR124

If you are looking for a powerful diesel truck charger, this is your answer. The Schumacher DSR124 is a professional-grade battery charger and engine starter from the ProSeries, specially designed for heavy-duty use.

This charger has 3 charging capability options: 6V, 12V, and 24V. This device produces up to 80 Amps for 330 Ah batteries to be able to jump and crank just about any diesel truck and other big machinery.

It comes with a built in sensor that prevents your battery from overcharging.

Schumacher DSR124 Picture

There is an LCD display on the top of the battery which makes it very easy to use. It also has a cool safety feature that prevents that charger from releasing power if the cables are not attached to the battery properly.

Key specs

Voltage, V : 6/12/24

Charging current, A : 15

Weight, lbs/kg : 70 / 31.8

Dimensions, inch: ‎34 x 20 x 16


Can charge 3 different battery types

Very powerful

Good safety and battery life features


Pretty big so it might be hard to store


NOCO GENIUS 10 – cheapest diesel truck battery charger

NOCO Genius 10

If you are looking for a cheap battery charger, you should check out the NOCO GENIUS 10. It only costs around $100 and should be able to charge your diesel truck battery as long as it has a 12V battery.

This charger is very compact and doesn’t take up much space. Aside from charging, it can also provide up to 150W which can jump start a smaller diesel truck.

This charger has many of the same features as the Noco Genius2x4, including battery overcharge prevention and temperature detection. Most importantly, it also has the battery recovery feature which can help restore deterorated batteries.

It can charge your diesel truck batteries in as little as 4 hours.

NOCO Genius 10 Picture

The NOCO GENIUS 10 is a budget-friendly charger and maintainer that would become your reliable assistant when the batteries of your diesel truck get discharged.

The only real downside of this charger is that some people have reported that it heats up if you charge your battery for a long time.

Key specs

Voltage, V : 6/12

Charging current, A : 10

Battery capacity, Ah : 230

Output power, W : 150

Weight, lbs: 3

Dimensions, inch/cm : 2 x 3 x 7


Compact but still powerful enough for a diesel truck

Can be used for 6V and 12V batteries

Very affordable


Heats up heavily during charging

Can’t be used to charge 24V batteries


Which battery should you jump your diesel truck off of?

First you should find the battery that has the thicker cables and then connect the battery cables to that one. If the cables are the same size, then either can be jumped.

How do you trickle charge a diesel truck?

First, make sure that both batteries are at full charge as trickle chargers are for maintaining a charge, and not recharging a low battery. Then connect the two negative posts and the two positive battery posts together, and then hook up the trickle charger to one battery.

Will a battery tender charge both batteries on a diesel?

Yes, you can hook your tender up to either of them and it will charge them both.

How does a diesel truck battery charger work?

A diesel truck battery charger converts 120 volts AC into 12 volts DC. The 12 volts are used to charge the battery in a car. The charger has a transformer inside of it that converts the voltage. It also has a rectifier that converts the AC into DC and regulates the voltage to 12 volts. There is a fan inside the charger for cooling purposes.

How do you charge a diesel truck with two batteries?

You can charge a diesel truck with two batteries by hooking up the positive from one battery to a switch and then hooking up the positives together. Then use a wire to connect the negative from each battery. Then when you turn on the switch, it charges both batteries at once.

What happens if I flip the charging cables while charging the battery?

If you flip the charging cables while charging the battery, it will create a spark. This could cause a fire, so it is not recommended that you do this. Instead, always make sure to follow the instructions that come with your battery charger.

How to test a battery charger for a diesel truck?

To test a battery charger for a diesel truck, you need to use a voltmeter. If the battery’s output is lower than 12 volts under load, there is probably something wrong with your battery charger.

Should I charge my truck battery at 2 or 10 amps?

It is recommended that you charge your truck battery at 10 amps. This will help to ensure that the battery is charged correctly. Charging at a lower amperage can take longer and may not fully charge the battery. It is also essential to ensure that the charger you are using is rated for 10 amps or higher.

Can I charge the diesel truck battery without removing it?

You can charge a diesel truck battery without removing it from the vehicle, but it is generally not recommended. This can cause damage to the battery and possibly other parts of your vehicle.

How long does it take to charge a diesel truck battery?

It will take between 10 and 20 hours to charge a diesel truck battery using a regular charger fully. If you are using a high-output charger, it will take between 5 and 10 hours to charge the battery fully.

How long do diesel truck batteries last?

Diesel truck batteries generally last between 3-5 years, depending on use.