Curated picks
Battery Isolators
Run a second battery without draining your starter battery
A battery isolator lets you add a second (auxiliary) battery for accessories, camping, or a winch, while protecting your main starter battery from being drained. Voltage-sensitive relays charge the second battery when the engine runs and isolate it when off.
We feature dual battery isolators and VSR kits on Amazon. Match the amperage to your setup and look for clear wiring instructions or a complete kit.
Top picks
Popular battery isolators
What to look for
- Amperage rating for your load
- Voltage-sensitive relay type
- Complete kit with wiring
- Quality terminals and fuses
FAQ
What does a battery isolator do?
Do I need a special battery?
Is wiring hard?
Keep browsing
Related categories
Portable Car Heaters
A plug-in 12V heater and defroster to warm the cabin
Explore →Car Humidifiers
A compact mist diffuser that freshens and moistens cabin air
Explore →Car Chargers
12V USB car chargers to keep phones and devices powered on the road
Explore →Bluetooth FM Transmitters
Add Bluetooth audio and hands-free calls to an older car stereo
Explore →Backup Cameras
Rear-view cameras that make reversing and parking easier and safer
Explore →Parking Sensors
Audible parking sensors that warn you of obstacles while maneuvering
Explore →Tyre Pressure Monitors (TPMS)
Real-time tire pressure monitoring to catch slow leaks before they spread
Explore →Jump Starters
Portable battery packs that start a dead car without another vehicle
Explore →