It shouldn't. When I hook up my battery cable I get a good spark like it is drawing a lot of power but my battery doesn't go dead from sitting. How many amps is yours drawing?
The initial spark you get when connecting the battery is the capacitor drawing its charge. It should fill itself up and hold it. I had an Advent that killed batteries if left connected. They replaced it. The new one does not drain the battery, but now my battery needs replacing :damnit:
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