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Bottom line is they are a MUST when using Lithium batteries. It’s more accurate way of measuring amps in and amps out on the batteries.
One glitch, confimed by the engineers at Magnum was the charger measures the voltage at the charger, not at the BMK. I learned this because I was getting a different voltage at the batteries than at the charger. And when you are asking the charger to make decisions on 0.1 Volts for establishing full charge, then that’s a problem. That’s why I converted to stop charge on returned amps. I had a 1000 amp hr bank. I stopped the charge when the charger got down to 50 amps or O.5C.
I am pretty sure we had this same conversation on IRV2.