True® Lithium Small Dual Battery Kit
$62.00
Item number: SBI-142-PL-SML
Suggested retail price $139.95
The True® Lithium Small Dual Battery Kit is engineered for close-proximity dual battery installations in 4WDs, boats, vans, and RVs. Designed with lithium compatibility in mind, this kit features a Smart Battery Isolator that automatically manages charging between your starter and auxiliary batteries. It ensures your primary battery remains fully charged to power vital engine functions while efficiently utilizing available voltage to maintain your secondary battery.
Description
Summary
1. When the engine is running and the charging source raises the voltage of the start battery to 13.5 volts* (cut in threshold), the True® Lithium Battery Isolation Manager (SBI) engages and connects the two batteries to charge simultaneously. The SBI’s internal LED will glow blue.
2. When all voltage sources drop below 13.2 volts* (cut out threshold) the Lithium Small Battery Isolator will disengage and the blue LED will go out.
3. When the SBI LED is out the batteries are separated thus preventing the power of your start battery from being drained by use of the accessories powered from the second battery.
4. When the vehicle is restarted and the start battery has recharged to 13.5 volts* the Lithium Small Battery Isolator engages, the LED will illuminate and the second battery is connected to receive charging.
*The True® Lithium Small Battery Isolator is programmed with a 10 second delay before engaging or disengaging.
LED Indications
On: Isolator engaged
Off: Isolator disengaged
Dimensions: 2.7(L) x 2.7(W) x 1.95(H) inches
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
Core Product Features
1. P.E.P. Programming Features Power Efficiency Programming (PEP), which maximizes charging efficiency from stator-based systems.
2. Dual Sensing Technology Monitors both batteries—if either receives a charge, the isolator engages to charge both simultaneously.
3. LED Status Indicator Built-in LED glows blue when engaged, this smart battery isolator for lithium battery is giving a clear visual cue of charging status.
4. Intelligent Voltage Sensing – Automatically engages and disengages based on voltage thresholds.
5. PEP® Technology (Power Efficiency Programming – Enhances performance and efficiency for lithium battery management
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1-year all-inclusive warranty
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