Roadsafe Universal Dual Battery Kit

RRP $220.00
SAVE $45.00 (20%)
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Due to popular demand Roadsafe 4WD have added a 13.3V Dual Battery Kit with Emergency Parallel Switch to the range.

The Roadsafe 4WD Dual Battery Kit is designed to allow the 4WD, caravan and boating enthusiast to run a second battery for all those power hungry outdoor accessories, without risking power drain from the vehicle's starting battery.

When installed in accordance with directions, the voltage sensitive relay (VSR) will stay open when the engine is started, isolating the starting battery, until the charge rate reaches 13.3 volts at which time the VSR closes allowing both batteries to be charged.

When the voltage of the cranking battery drops to 12.8 volts the relay isolates the two batteries leaving the cranking battery fully charged while the auxiliary battery continues to power the accessories.

The next time the vehicle's engine is running, the starting battery is charged back up to 13.3 volts, at which time the VSR redirects the charge back to the auxiliary battery.



  • Automatically isolates the starting battery from the
  • auxiliary battery
  • Suitable for 4X4, Marine, Truck, Caravan & camping
  • applications
  • No need to modify vehicle wiring
  • Kit contains all components required to complete the job
  • Voltage sensitive relay rated at 140 amps
  • Proven reliability over many years
  • Easy to install
  • 12 months warranty


Does not suit FORD PX Ranger or Other Vehicles equipped with a Smart Charge alternator.

These types of Vehicles with Computer Controlled Variable Rate Alternators require a DC to DC charger for Dual Battery Setup


Barcode # 9.32E+12
Brand Roadsafe 4WD

Check our Warranty Page

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