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I put in an AGM battery, which will hold a charge longer than a lead-acid battery, especially in the cold. I also had a battery tender, but I removed it because I find it easier to just disconnect the negative battery terminal if I will be out of town for more than a week or so. This has no detrimental electrical effects whatsoever on the ECU (2003 S), although of course I do need to reset the clock. When I disconnect the battery, I remove the hood catch (2 bolts) so the frunk can't lock.
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