LiTime 12V 40A DC to DC Battery Charger
Compatible with alternators, including vehicle alternators.
COMPATIBILITY：Supports multiple battery types with selectable 20A/40A charging current, suitable for different battery capacities and charging needs.
SMART CHARGING: Automatically applies 2-step charging (CC,CV) for LiFePO4 and 3-stage charging (Bulk/Absorption/Float) for lead-acid batteries, with lithium battery wake-up support after BMS protection.
STABLE & RELIABLE: Built-in cooling fan ensures efficient heat dissipation and stable high-current charging.
MULTI PROTECTION SAFETY：Built-in over-voltage, low-voltage, over-temperature, short-circuit, and reverse-polarity protection. Isolated input and output help prevent voltage transfer errors and interference with battery charging.
STRAIGHTFORWARD SETUP: Clear wiring and simple mode selection make installation and operation easier.
WIDE APPLICATION：Compact and durable for RVs, commercial vehicles, and other DC power systems. The output supports both batteries and DC loads.
Note: Use the included screws (Φ5/32'' [4mm], 5/8'' [16mm]) for secure mounting to prevent installation failure or product damage.
FedEx, UPS, or Amazon Logistics.
BASIC
DIMENSIONS
TEMPERATURE
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 jump start lithium batteries that have become discharged to a low voltage.
How do I know if the charger is working properly?
To check if the charger is working properly:
- Make sure the fault LED indicator is off — this means the charger is working normally.
- If the fault LED indicator is on, identify the cause of the fault and resolve the issue (e.g. voltage, polarity, temperature, or short circuit).
Is the charger safe to use in harsh weather conditions?
This charger has a durable, rugged design suitable for moderate outdoor environments. However, avoid exposure to extreme weather conditions like heavy rain or snow, as it is not fully waterproof.
What protective features are built into this DC-DC charger?
The charger includes overcharge protection, reverse polarity protection, overcurrent protection, and thermal protection to ensure safe and reliable charging.
Why isn't my DC-DC Charger working?
When a DC-DC charger fails to initiate a charge cycle with a LiFePO4 battery, the cause often lies in incorrect settings or insufficient input voltage. Whether the lights are flashing an error code or appear normal, our guide can help you diagnose the specific issue.
Access the In-Depth DC-DC Charger Technical Guide here.
Official Website Only
Advantages of Buying from LiTime.com: Benefits, Discounts, And VIP Service
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.
17-Year Expertise
With 17 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.
Expert-Backed Quality
LiTime is certified by top organizations like RVDA, backed by over 70+ patents and recognized for quality. Let authorities and patents prove why LiTime leads 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.User-Driven Power Stories
See how LiTime batteries are changing the way real users power their lives.
Power You Can Trust, Backed By Experts
The Power Behind Experts, Adventures, And The World’s Best
