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surface of LiTime 40A dc to dc lithium battery charger

dimension information of LiTime 40A dc-dc charger and mounted ways recommended

wiring diagram of the usage of litime 12v 40a dc to dc battery charger

protections of LiTIme 40a dc to dc charger over voltage, low voltage, high temp, short circuit, reverse polarity

input side and output side appearance of LiTime 40A dc to dc charger

litime 40a dc-dc charger for compatible multiple battery types STD, GEL, AGM LFP batteries

pakage information of LiTime 12v 40A dc-dc charger

dc load mode feature of litime 40amp dc to dc charger

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Features

LiTime 12V 40A DC to DC Battery Charger

C$175.49

C$189.99

7% OFF

COMPATIBILITY Knob operation makes it convenient to quickly select the type of battery that needs to be charged. The output current of the charger is 40A, with high efficiency and adaptability to larger capacity battery packs; There is a low current port that can limit the output current to 20A. There are two charging and discharging current options, 20A and 40A, which are convenient for use in multiple scenarios.

SMART MULTI-STAGE CHARGING The 12V 40A DC to DC smart charger changes different charge modes to match your battery type. For LiFePO4 Battery it will charge in 2-step mode (CC, CV), for Lead Acid Battery it will charge by 3-stage charging (Bulk, Absorption, and Float). It can optimize the charging efficiency of different types of batteries and extend their service life. It also can wake up your lithium battery after BMS protection.

VARIOUS PROTECTION SAFETY This LiTime battery charger with high-quality offers over-voltage protection, low-voltage protection, over-temperature protection, short circuit protection, and output reverse polarity protection to ensure operation safety. It also isolates the input and output to prevent voltage transfer errors and interference with home battery charging.

WIDELY USED The compact and robust design of LiTime 12V 40A DC to DC charger makes it suitable for RVs, commercial vehicles, boats, yachts, and many more applications. The output end can not only be connected to a service battery but also be directly used with a DC load.

Note: Use the included screws (Φ15/64'' [6mm], 15/32'' [12mm]) for secure mounting to prevent installation failure or product damage.

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12V 40A DC-DC

C$175.49

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FEATURES SPECS FAQ REVIEWS

Get Your Battery to 100%

Power your off-grid system reliably with the LiTime 12V 40A DC-DC Battery Charger. Designed to pull power from your vehicle's alternator or starting battery, this charger ensures your 12V house battery receives a full, stable charge while you drive. It's the ultimate solution for keeping your batteries topped off, offering a Safe, Fast, and Efficient charge for your RV, van, or marine setup.

LiTime 12V 40A DC to DC battery charger, designed for safe, fast, and efficient charging

Multiple Protections for Total Peace of Mind

This DC-DC charger is engineered with a robust safety system to protect your batteries, your vehicle, and your investment. Charge with confidence, knowing you are fully covered by:

Over Voltage Protection: Prevents damage from excessive voltage.

Low Voltage Protection: Safeguards your batteries from over-discharge.

High Temperature Protection: Automatically manages operation in extreme heat.

Short Circuit Protection: Guards against dangerous electrical shorts.

Reverse Polarity Protection: Prevents damage if terminals are connected incorrectly.

protections of litime 40a battery charger dc to dc

Multiple Options for Charging 12V Batteries

This 40A DC-DC charger isn't just for lithium—it's a universal 12V charging solution. With selectable charging modes, you can provide the perfect, optimized charge profile for any 12V battery chemistry. It's fully compatible with:LFP (LiFePO4), AGM, GEL, STD (Standard Flooded).

Simply select the correct battery type before use to ensure a safe, fast, and efficient charge that's perfectly tailored to your battery's needs.

litime 12v 40amp dc to dc charger suitable for multiple types 12v batteries

Always Keep the Power On the Go

The LiTime DC-DC charger is the key to unlocking true off-grid freedom. It intelligently connects your vehicle's starter battery to your house battery (like a LiTime Lithium Battery), using your alternator to charge your service battery while you drive.

This ensures you can charge your batteries with the appropriate voltage and current, so you always arrive at your destination with a full charge, ready for your adventure.

LiTime 40A DC to DC charger's ability to charge all batteries with the appropriate voltage and current

Recommended Cable Sizing & Fusing

Proper installation is essential for safety and optimal performance. This guide provides the correct cable and fuse ratings recommended for your 40A DC-DC charger. Recommended Fusing (Rated 40A):Input (Starter Battery): 60A Fuse; Output (House Battery or DC Load): 50A Fuse

Recommended Cable Sizing: 1-5m (3-16 ft): 7AWG (Input) | 8AWG (Output); 5-9m (16-30 ft): 6AWG (Input) | 6AWG (Output)

Following these guidelines ensures a safe, reliable connection and protects your entire system.

recommended cable sizing and fusing for litime 12v 40a dc to dc charge controller

Low Current Port for Added Flexibility

For total control over your system, the charger includes a Low Current (LC) port. By connecting the LC port to the IN+ port with the provided signal cable, you can easily limit the charging current from 40A down to 20A.

This is an ideal feature for protecting vehicles with smaller alternators or more sensitive electrical systems. If you don't need current limiting, simply leave the port disconnected to use the full 40A capacity.

low current port of litime dc to dc battery charger

BASIC

Charger Type：

LiFePO4

Output Voltage：

14.6V

Output Current：

50A

What type of alternator is this DC to DC on board battery charger compatible with?

This battery charger is designed to work with both conventional and smart alternators. However, because conventional alternators maintain a consistent voltage during charging, while smart alternators adjust their charging output based on operating conditions, it is necessary to connect the charger to the smart alternator using the Signal cable provided with the package through the Vehicle Ignition Port.

What types of battery does the charger support?

It's suitable for 12V Lithium, Gel, AGM, and Calcium batteries. This charger enables the batteries to reach a full 100% charge. Additionally, it has the capability to revive lithium batteries that have become discharged to a low voltage.

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Why LiTime is Your Best Choice

TOP 1 LiFePO4 Brand

As the #1 LiFePO4 battery brand, LiTIme leads the market with the most complete power solutions—covering RVs, home storage, marine, golf carts, off-grid systems, and beyond.

15-Year Expertise

With 15 years of industry experience, LiTime serves over 350,000+ users globally, ensuring quality and trust. LiTime keeps innovating and has your back, always.

24/7 Expert Support

With 24/7 expert support and an average 24-hour response time, we ensure you get the help you need, anytime. Whether it's pre-sales or after-sales, we guarantee 100% support every step of the way.

Industry-Leading Tech

With EV-grade cells passing 80+ tests and a self-developed BMS with under 1% margin of error, LiTime batteries ensure 15,000 cycles, 20+ protections, and up to 10 years of reliable performance.

Cutting-Edge Features

LiTime batteries offer a range of advanced features, including Bluetooth, low-temperature protection, self-heating, high-rate discharge, pre-charging, ensuring reliable power and peace of mind in any environment.

Expert-Backed Quality

LiTime is backed by over 70+ patents and recognized for quality. Let authorities and patents prove why LiTime leads the way.

Trusted by Users Worldwide

Powering the World, Trusted by All

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User Insights

Hamjazz

I’ve been using the battery primarily as an emergency power backup at home — it gives me peace of mind knowing I’ve got reliable energy if the grid goes down.

Esther Snow

Drop in for our travel trailer Great addition to our travel trailer. Now we can spend endless time at a remote campsite without worrying we will run out of power.

James

Omg awesome! Things are looking great so far. With all the great reviews on the web. I’m feeling pretty good about the two 200 AH batteries I bought. Thank you for a great product

Allan

Fairly light weight at 80 lbs. Only took about a day to fully charge with solar panels, and it runs my 3000 W inverter with no issues. 400ah is well worth getting instead of 4-100ah batteries connected together due to less wiring and possible loose connections. Highly recommend.

Donald L Anderson

Installed 2 100ah batteries in boat as my house bank with the Litime DC to DC 40amp charger to protect alternator. I have to say very happy with everything.

Hamjazz

I’ve been using the battery primarily as an emergency power backup at home — it gives me peace of mind knowing I’ve got reliable energy if the grid goes down.

Esther Snow

Drop in for our travel trailer Great addition to our travel trailer. Now we can spend endless time at a remote campsite without worrying we will run out of power.

James

Omg awesome! Things are looking great so far. With all the great reviews on the web. I’m feeling pretty good about the two 200 AH batteries I bought. Thank you for a great product

Allan

Fairly light weight at 80 lbs. Only took about a day to fully charge with solar panels, and it runs my 3000 W inverter with no issues. 400ah is well worth getting instead of 4-100ah batteries connected together due to less wiring and possible loose connections. Highly recommend.

Donald L Anderson

Installed 2 100ah batteries in boat as my house bank with the Litime DC to DC 40amp charger to protect alternator. I have to say very happy with everything.

LiTime 12V 40A DC to DC Battery Charger

Get Your Battery to 100%

Multiple Protections for Total Peace of Mind

Multiple Options for Charging 12V Batteries

Always Keep the Power On the Go

Recommended Cable Sizing & Fusing