![]() Thus, your secondary battery starts charging. ![]() When the VSR detects that the car is on, it says "Hey the car's on! OK let's connect the two batteries". The VSR is triggered by detecting when the alternator is running and charging the car battery. This lets you run those accessories without drawing too much current through a single wire.Ī VSR is a relay that separates the car's main cranking battery and the secondary accessories battery. In cars and motorcycles, you use a relay on something like the accessories wire (that's only live when the bike is on) to power other high-current accessories, like extra lights, a fridge, or heated grips. This is suitable for under-bonnet set-ups where cables are short and batteries are the same kind.Ī VSR is a high-current relay that has simpler wiring than most relays.Ī relay (for those who don't know) is a switch that's triggered by voltage. The next best dual-battery system is one with a VSR. Won't work with latest cars (~2015 onwards) with smart alternators.Prevents you from draining starter battery.Dual Battery Systems with a VSR (Voltage Sensitive Relay) ![]() So a dual battery system in parallel will work and won't cause any huge problems, but it doesn't cost much to go to the next best solution: a VSR. If your starter battery fails, you can perhaps use current from your accessories battery to either start the car, or to charge your cranking battery.
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