The Original Retailer of True® Dual Smart Battery Isolator

True® Dual Battery Isolators

Automatic Battery Management for Hassle-Free Adventure

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Official Retailer for TrueAm, Inc. - Automatic Dual Voltage-Sensing - Ignition Surge Protection - Zero Voltage Drop - Compact & Rugged Design - Maintenance-Free

PRODUCT WARRANTY

1 Year Free Replacement

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TRUE AMALGAMATED, INC.

Authorized Retailer

Best Sellers

DFNA.info is the premier authorized retailer for True Amalgamated (True®), a brand synonymous with high-end, “plug-and-play” dual battery management. Their best-selling products center around the True® Smart Battery Isolator (SBI), a 140A voltage-sensitive relay (VSR) renowned for its “set-and-forget” reliability. Unlike traditional diode isolators, True® units use advanced MOSFET technology to ensure zero voltage drop, delivering maximum charging efficiency to your auxiliary battery without risking the primary starter battery.

What is True® Isolator

True® Dual Battery Isolators are smart relay systems designed to manage two batteries in vehicles like trucks, RVs, boats, and UTVs. They automatically separate or connect the batteries to ensure your main battery is never drained, while still allowing your auxiliary battery to charge when the engine is running.

What They Do?

  • Automatic Isolation: Keeps the starter battery safe from being discharged by accessories.
  • Smart Connection: When the engine is running and voltage is high, it connects both batteries so the auxiliary battery charges.
  • Protection: When the engine is off, it disconnects the batteries so lights, winches, stereos, or other gear only draw from the auxiliary battery.
  • Hands-Free Operation: No switches or manual intervention needed — it’s fully automatic.
For AGM
For Lithium

Automotive Applications

True Dual Battery Isolators are built for demanding automotive applications where reliable power management matters most. Designed to automatically manage and protect your primary and auxiliary batteries, they ensure your starter battery is always ready to go while safely charging your secondary battery.

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Trusted by Leading Brands

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A TRUE®  exclusive!

UTV Applications

The smart isolator automatically senses voltage to connect or disconnect the batteries for efficient power management. It protects the main starter battery from being drained by accessories when the engine is turned off. Both batteries are charged at the same time once the vehicle is running and sufficient voltage is detected. The heavy-duty design supports high current loads for winches, lights, and other UTV accessories.
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Real Customers. Real Moments. Real Demand.

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For Lithium Batteries

The smart isolator automatically senses voltage to connect or disconnect the batteries for efficient power management. It protects the main starter battery from being drained by accessories when the engine is turned off. Both batteries are charged at the same time once the vehicle is running and sufficient voltage is detected. The heavy-duty design supports high current loads for winches, lights, and other UTV accessories.
View all isolators for Lithium batteries

What is True® Battery Cables

Engineered for high-demand electrical environments, these cables are designed to exceed standard performance expectations by utilizing full American Wire Gauge (AWG) specifications. Unlike “oversized” cables that use thick insulation to hide thin wire, our True 4 Gauge cables deliver 100% pure conductivity.

Features

  • 1. Heavy-Duty 4 AWG Gauge
  • High-Quality Copper Conductors
  • Stranded Cable Construction
  • Pre-Installed Heavy Duty Terminals
  • Clear Adhesive-Lined Heat Shrink
  • Made & Assembled in the USA
For EZGO
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4WA battery-cables

This site was designed by a person who appreciates those who “DO IT YOURSELF”

All the True® Smart Battery Isolator kits available through this website have been used by us personally and proven through application to be good for automotive, side-by-side, UTV, and marine applications. This True® technology truly does what it is supposed to do. You will find video installation instructions and directions for using these Smart Battery Isolator kits as we have used them. Our hope is to actually make DIYers lives a little easier as we go. Or to possibly provide the best Smart Battery Isolator kit to some of the automotive shops around the United States so that they can, in turn, offer the related services of installation and use of these automotive products.