Description
Trusted by Leading Brands
A TRUE® exclusive!
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.
This delay ensures stable voltage levels are maintained, preventing false triggers and helping protect both batteries during transitions.
LED Indications
On: Lithium Isolator engaged
Off: Lithium Isolator disengaged
Dimensions: 2.7(L) x 2.7(W) x 1.95(H) inches
Testimonials
“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® Large 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.
Install was clean, and the unit feels built for real-world abuse. If you’ve got a Silverado and serious power needs, this isolator is the upgrade you didn’t know you needed—but won’t want to live without.”
Austine Jones, Arizona
Frequently Asked Questions
1. Does installation require alternator or ignition wiring?
True® kits are OEM-friendly and require no alternator or ignition connection, simplifying installation
2. What are the voltage engagement/disengagement thresholds?
3. What accessories can be powered by the auxiliary battery?
4. Is there a warranty or return policy?
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
Joseph Robinson –
A Bit Pricey, But Justified
Cheaper isolators fried my lithium battery. This one does the job right. The cost is worth the peace of mind.
Michael Harris –
Cables Could Be Longer”
Had to buy extensions for my truck’s dual-battery setup. Isolator itself is fantastic, but include longer cables, True®!
Megan Lewis –
Plug-and-Play Simplicity
Installed in 20 minutes—no fuss. The LED lights make it easy to diagnose charging status. Perfect for my RV’s dual-battery system.
Christopher Taylor –
Silent and Efficient
No annoying clicks or delays—just smooth, lithium battery isolator switching. My fridge runs all night without draining the starter battery. Worth every penny
Jessica Miller –
Installation Took Some Effort
Performance is stellar, but the wiring diagram could be clearer. Had to consult a forum to get it right. Once set up, it’s been bulletproof.
Joseph Martinez –
No Heat Issues
“Runs cool even in 100°F weather. Previous isolators overheated; this one doesn’t. Huge win for desert camping
Emily Johnson –
Perfect for My Overland Rig
Keeps my LiFePO4 battery charged without overloading the starter battery. Handles my fridge and lights effortlessly. Zero issues after 8 months of rugged use!
Michael Brown –
Lithium-Specific? Finally!
Most isolators don’t work well with lithium batteries—this one does. Charges at the right voltage and stops when full. This lithium dual battery setup is a game-changer for my solar setup.
Matthew Davis –
Wish It Had Bluetooth Monitoring
Works flawlessly, but for the price, I’d love an app to check battery status remotely. Still, the best isolator I’ve used for my campervan.
David Wilson –
Saved My Boat Batteries
No more dead cranking battery! This isolator intelligently manages power between my lithium house battery and lead-acid starter. Marine-proof and reliable.
James Anderson –
Works with Smart Alternators!
Finally, a smart lithium isolator that plays nice with my Jeep’s alternator. Charges my lithium auxiliary battery perfectly, even at variable voltages.
Christopher Martin –
Zero Voltage Drop
My winch used to kill my primary battery. Now, the isolator ensures my lithium battery takes the load. Voltage stays rock-steady.
Amanda Thompson –
Ideal for Solar + Lithium Combos
Pairs perfectly with my 200W solar panel. Charges efficiently and protects both batteries. No more anxiety about power on long trips.