The MUS 4.3 does not have the "supply" mode setting that the larger CTEK maintainers do, which is what you normally would use for this purpose. That said, use the normal battery setting, AND BE SURE TO PUT PLASTIC BAGS OVER THE ENDS OF THE BATTERY CABLES after you disconnect them as they will remain "hot" because of the maintainer connection. When you install the new battery, hopefully an AGM model, connect the positive cable first, then the negative, being sure to not let them touch anything while you are in the process of connecting them.
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“Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein
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