Dual Battery Charging Behaviour
I agree Josh. These are simple parallel batteries in circuit. They can’t show a different voltage potential when they’re connected together when the flow of current is so low as when the vehicle is off.
If the aux discharges faster than the starter, assuming the Traxide is connecting them together, then the starter will flow to the aux to compensate. It’s simple electron flow and potential difference won’t be maintained.
I’d be inclined to suggest the BMS monitors aren’t as accurate as they could be. The only time I’d expect significantly different voltages is if they’re not connected to each other or the current draw is so large that they can’t stabilise between each other. Otherwise, the voltage eg potential should be the same, even if their actual capacities aren’t equivalent. That’s my understanding of electronics over time. Eg you can have a dud aux but when it’s connected in parallel to a good starter, it’ll show good voltage measured in circuit, but will not provide any actual amperage capacity to the circuit - where the starter provides it all. The only way to determine that is isolation of each battery to measure health and capacity.
2010 TDV6 3.0L Discovery 4 HSE
2007 Audi RS4 (B7)
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