Using a Hardkorr battery box with voltage-sensitive relay (VSR) is the simplest way to create a dual battery setup in your vehicle. The VSR acts as an isolator, allowing the auxiliary battery (inside the box) to charge directly from the crank battery while the car is running. Note: Not suitable for Lithium Batteries.
What is a VSR Voltage Sensitive Relay and How to install VSR? VSR
Bluetooth Battery Monitor with High-Precision 500A Shunt 1 Stop Camping Shop
Bluetooth Battery Monitor with High-Precision 500A Shunt %
Wooden Luggage Rack
Hardkorr Heavy Duty Battery Box with BCDC140D Combo
Hard Korr 12V DC Power Distribution Box - Mini – Rogue Canopies
Hard Korr Voltage Sensitive Relay Kit for Heavy Duty Battery Box
Dual Battery Wiring Kit For HardKorr Battery Box
Wireless Magnetic Tow Light Kit, Rechargeable Battery Tow, 60% OFF
Hardkorr Heavy Duty BATTERY BOX
Projecta VSR100K 12V 100A Voltage Sensitive Relay Kit - Auto One
12V DC Power Distribution Box - Large – Rogue Canopies