True® Large Dual Battery Kit
$85.00
Item number: DBK12LARGE
Suggested retail price $162.95
Everything needed to connect a second 12 volt battery located as far as 20 feet from the primary battery.
Includes:
- 1 Smart Battery Isolator with mounting screws
- 20 feet #6 high flex red cable with tinned copper cable lugs
- 3 feet #6 high flex black cable with tinned copper cable lugs
- 2 positive brass alloy battery terminal ends
- 1 negative brass alloy battery terminal end
- 3 loose crimp on tinned copper cable lugs
- 2 sections of adhesive lined shrink tube
- 5 zip ties
- 1 installation instructions booklet
This product comes packed in the full color display box for retail display or in a heavyweight zip bag for installer use.
Description
True® Large Dual Battery Kit – Power You Can Trust
Take control of your vehicle’s electrical system with the True® Large Dual Battery Kit—engineered for serious off-road, marine, and RV applications. Featuring a 140A voltage-sensitive relay, this kit automatically prioritizes charging your starter battery while powering accessories from a secondary source. No switches, no voltage drop—just smart, seamless power management.
Includes 20ft of high-flex #6 red cable, 3ft black cable, brass alloy terminals, and mounting hardware for a clean, durable install. Whether you're running winches, lights, or sound systems, this kit delivers reliable performance in the harshest conditions.
Built tough. Runs smarter. Installs fast.
Trucks & 4WDs
Powers winches, lighting, fridges, and inverters from an auxiliary battery while protecting the starter battery from drain—ideal for off-road, worksite, and overland setups.
Cars & SUVs
Supports aftermarket accessories like sound systems, dash cams, and emergency lighting without compromising engine start reliability.
Boats & Marine Vessels
Separates house and engine batteries, ensuring navigation, bilge pumps, and onboard electronics run independently and safely.
RVs & Campers
Keeps living space powered with solar, lighting, and appliances while maintaining a charged starter battery for travel.
Commercial Fleets
Enables reliable accessory use (e.g., GPS, radios, refrigeration) in delivery vans and service vehicles without risking downtime.
Emergency and Service Vehicles
Essential for maintaining the charge of batteries dedicated to life-saving or essential service equipment, ensuring reliability when the vehicle is stationary or idling.
“The True® Lithium Kit was a game-changer for my 4WD setup. Easy to install and rock-solid performance on long trips.”
— Mark T., Minnesota
“Installed it in my boat—no voltage drop, no drama. The waterproof cabling and smart relay are top-notch.”
— William L., Utah
“Perfect for my caravan. The automatic battery management saves me time and worry—highly recommended.”
— Dave R., Colorado
Amazon Rating
- Priority Charging for Starter Battery
Ensures your main battery is fully charged before directing power to the auxiliary battery. - Heavy-Duty, No-Volt-Drop Design
Built to handle alternator outputs up to 150 amps with guaranteed no voltage drop across the system. - High-Flex #6 Gauge Cables
Includes 20 ft of red and 3 ft of black cable for flexible installation in larger vehicles. - Brass Alloy Terminals & Mounting Hardware
Corrosion-resistant components ensure long-term durability and secure connections. - Compact & Maintenance-Free
Rugged, sealed design stands up to vibration, moisture, and extreme conditions—ideal for 4WDs, boats, trucks, vans, and RVs. - Smart Power Management
Seamlessly powers winches, lighting, sound systems, and other accessories without draining your starter battery.
Additional information
| Weight | 4.00 lbs |
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