Seems like we just covered this a couple of days ago. +1 for Battery Tender Jr. I stopped bothering with one when I bought an AGM battery. Now I don't do anything unless I will not be driving for 10 days or more. Then I disconnect the negative battery terminal and remove the frunk latch (2 bolts). My computer doesn't seem to notice; I just need to reset the clock afterwards (2003 S).
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