Trusted by Leading Brands A TRUE® exclusive! The Large Lithium dual battery kit is for boats, cars, 4WDs, trucks, Vans, RVs, or general automotive & marine applications. The True® Lithium 140 Amp voltage sensitive relay offers priority charging for your primary/starting battery, can be used with alternators with outputs up to 150 amps. The True® Lithium dual battery kit offersautomatic battery management easy to install lithium dual battery system with a wiring diagram Waterproof cable shockproof, casing, and heat resistant cables for safe and efficient use of the auxiliary battery system.Everything needed to connect a second lithium battery located as far as 20 feet from the primary battery. Testimonials Installing the True Lithium Dual Battery Kit in my RV completely changed the way I travel. I can run my fridge, lights, and electronics for days without worrying about draining the starter battery. The isolator seamlessly manages charging between my lithium house battery and the main battery, giving me reliable power on the road and at camp.Setup was straightforward, and the peace of mind is priceless. Whether I’m boondocking or on long cross‑country trips, this kit ensures my RV always starts strong while keeping my gear powered. It’s the upgrade every RV owner should make for dependable energy and worry‑free adventures. William Merker, Minnesota Frequently Asked Questions 1. How does the isolator prevent overcharging? It doesn’t regulate amps directly; overcharging is controlled by your vehicle’s voltage regulator and alternator. The isolator connects once the main battery reaches 13.4V, sharing charge with the auxiliary battery 2. What types of batteries are supported? Design for lithium batteries but still works with AGM, and lead-acid batteries, making it versatile for dual battery setups 3. Does it protect against ignition surges? Yes, it includes ignition surge protection to safeguard sensitive electronics 4. Does it affect my warranty? It’s OEM warranty‑friendly, meaning it doesn’t interfere with factory systems 5. How do I monitor battery status? Optional Single Meter Dual Display (SMDD) shows real-time voltage for both batteries.Saves space and simplifies monitoring 6. Is a dual battery system worth it? For off‑roaders, campers, and heavy‑duty users, it ensures dependable starting power and extended accessory use, making it a valuable upgrade 7. Where is the second battery located? The auxiliary battery is usually mounted under the hood on the driver’s side, near the firewall
