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I see it as a spare part, if the main battery dies for some reason there is an identical spare sitting there ready to go.OK, so I know electrics threads can become warzones and I don’t want that, and I’m a self confessed numpty when it comes to this stuff. But how will a standard starting battery (assuming that’s what this is) handle the charge/ discharge/ charge / discharge life of a aux battery used for running a fridge etc etc that (pre lithium) we would always go to a deep cycle battery?
I’m not seeing their aux battery option (a non delete in the trialmaster) as being something I’d run with.