battery died

[gamemannn 10+ year member]

my car has been been sitting in my drive way for over 3 months (won't start up), and yesterday i went out to remind my self how good my system sounds but my battery was dead. how is this possible? the battery hasn't had any serious pull on it in like 2 months and had had set with no pull what so ever for at least 2 weeks. can an ungrounded or badly grounded switch to an amp or anything that needs a ground pull on battery in an car that is not being used???

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