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Message: <blockquote data-quote="57chevythunder" data-source="post: 20402" data-attributes="member: 4881">Good question and comments.  And the way to make the parasitic draw (which all later model vehicles have, with may variables, and some worse than other) a non-issue is to plug in your battery maintenance device at the end of every day. -not just for periods of non-use.When a battery is subjected to parasitic draw it slowly and steadily goes deeper and deeper into percentages of "sulfation" which is the number one enemy of battery service life.  Even though battery technology has improved, service life has not. Personally I have found the Del Tran product line of Battery Tenders -NOT trickle chargers, is the best way to go.This diligence for the past few decades has at least doubled the battery life in every one of our cars and trucks.</blockquote>