Really a simple ( dumb) question I think ... I'm replacing batteries to an older Argo control model ( dark blue 102B ).
Before replacement of the AA batteries ... no display when switched ON.
After replacement of the AA batteries ... normal looking display & operation when switched ON.
As I get no BATTERY FLAT display I assume the 3V lithium battery still is good.
But, I want to replace the 3V as I do not know its age.
Reading the manual: I just open the hatch and replace it ( being careful of static issues ).
I assume the the controller ON/OFF switch is in the OFF position .... YES?
Or, should it be ON (to supply voltage) when the 3V lithium is out of the holder so I don't lose memory?
Brooks
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