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In normal conditions, modern EVs can lose 1% of their state of charge per day while parked, but it's often far less than that.
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The main causes of "vampire drain" include security systems (like Tesla Sentry Mode), topping up the 12-volt battery, and thermal management that keeps the battery's temperature in a safe range.
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Cold temperatures can also make your displayed range drop overnight without actual battery drain.
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For times when you expect your EV to sit parked for an extended period, it's best to turn off unnecessary features (like Sentry Mode) and keep your car plugged in if possible.
You park your electric car with what looks like enough range for tomorrow’s errands. It stays still until the next morning. But when you get in, the display shows that you have fewer miles left than before. It didn’t move overnight, so where did the range go? And how much can you expect to reasonably lose?
