True® Smart Lithium Battery Isolator

How True® Lithium Isolator Works?Once the engine is running and the charging system boosts the start battery’s voltage to 13.5 volts—the SBI's cut-in threshold—the True® Smart Battery Isolator for lithium battery activates. It then links both batteries, allowing them to charge at the same time. A blue glow from the internal LED signals that the system is engaged.When every voltage source falls below 13.2 volts—the SBI's cut-out threshold—the True® Lithium Battery isolation manager disengages, separating the batteries. The internal blue LED switches off, indicating that the system is no longer actively charging.When the True® lithium battery isolator switch’s LED indicator turns off, it signifies that the primary and secondary batteries have been electrically isolated. This disconnection prevents parasitic loads on the auxiliary battery from depleting the charge of the start battery.After restarting the vehicle, once the start battery reaches 13.5 volts—the designated engagement threshold—the True® Smart  Lithium Battery Isolator switch activates. The LED lights up, signaling that the secondary battery is now connected and charging.Trusted by Leading Brands A TRUE®  exclusive!Why Choose True® Lithium Battery Isolator?Optimized for Lithium BatteriesUnlike generic isolators, the True® Lithium Smart Battery Isolator is engineered with lithium chemistry in mind. This ensures that charging characteristics match lithium battery requirements — protecting battery health and improving charging efficiency.Smart, Automatic Voltage-Sensing ManagementTrue® lithium isolators automatically connect and disconnect the auxiliary battery based on real-time voltage levels. They engage when the starter battery reaches a charging threshold (around 13.5 V) and disengage when voltage drops below a set level (around 13.2 V), protecting the main battery from discharge by accessories.Built-In Surge and Ignition ProtectionThese isolators include protections against ignition voltage spikes, helping safeguard sensitive electronics and ensuring system reliability. *The True® Smart Battery Isolator for lithium battery  features a 10-second delay before engaging or disengaging.This delay ensures stable voltage levels are maintained, preventing false triggers and helping protect both batteries during transitions. LED IndicationsOn: Lithium Isolator engagedOff: Lithium Isolator disengagedDimensions: 2.7(L) x 2.7(W) x 1.95(H) inchesTestimonials I run a 2021 Chevy Silverado with dual batteries, a winch, and a sound system with a large speaker setup that hits hard. Before installing the True® Battery Isolator, I was always second-guessing my setup—especially during long job sites or weekend overlanding trips.This isolator changed everything. It automatically manages the charge between my starter and auxiliary batteries without me lifting a finger. No switches, no worries. I can run my gear all day and still fire up the truck without hesitation.Austine JonesARIZONA Installing the Silverado Battery Isolator was one of the best upgrades I’ve made to my truck. I run a lot of accessories—lights, winch, and a fridge for camping—and this isolator keeps my starter battery safe while powering everything else. The automatic switching is seamless, and I never worry about being stranded with a dead battery. It’s rugged, reliable, and built for real-world use. I recommend it to any Silverado owner who values dependable power management on and off the road.Logan ParkerCOLORADO Ready to InstallEverything you need, right in the box. With detailed instructions and all hardware included, you’ll go from unboxing to fully mounted in no time. Simple, solid, and DIY-ready.eBay top-rated seller One of eBay’s most reputable sellers, consistently delivers outstanding customer service. Amazon Ratings: 4.8 out of 5Reflecting consistently high satisfaction and positive reviews from Amazon buyers.Frequently Asked Questions Does installation require alternator or ignition wiring?  True® kits are OEM-friendly and require no alternator or ignition connection, simplifying installation What are the voltage engagement/disengagement thresholds? Typically engages at ~13.4V and disengages at ~12.8–13.2V to prevent starter battery drain What accessories can be powered by the auxiliary battery? Winches, lights, refrigerators, audio systems, and other high-draw accessories. Is there a warranty or return policy? Kits are typically covered by manufacturer warranty and retailer return policies (e.g., True® offers warranty-friendly designs) How do I monitor battery status?  Optional Single Meter Dual Display (SMDD) shows real-time voltage for both batteries.Saves space and simplifies monitoring Can the auxiliary battery drain the starter battery? No, the isolator disconnects when voltage drops, ensuring the starter battery retains enough charge. What is P.E.P.® (Proprietary Efficiency Programming)? P.E.P.® is TrueAm’s smart logic that optimizes battery protection and charging efficiency.It ensures the isolator only connects when safe and beneficial for both batteries Does it regulate charging amps? No, the SBI doesn’t regulate amperage. That’s handled by your alternator and voltage regulator.The SBI simply controls when the second battery is connected based on voltage thresholds. Can I manually override or shut it off?  The male connector underneath can be wired for remote shutoff.Inline switches are optional but not required—SBI handles disconnection automatically. How do I monitor battery status?  Optional Single Meter Dual Display (SMDD) shows real-time voltage for both batteries.Saves space and simplifies monitoring Is it compatible with all batteries? It’s designed specifically for Chevy Silverado and GMC Sierra trucks, but can also be adapted for other GM vehicles with similar 12V systems