When i leave my car parked and off for more than a month i often have to charge/replace the battery. However when i disconnect the battery it somehow lasts way longer. I cant think of anything that is on all the time when my car is parked (no alarms, remotes)
Make sure you don’t leave a phone charger plugged in. Some charge ports are powered with the ignition off and some chargers draw current even when not charging anything.
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