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.

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.

Cold temperatures can also make your displayed range drop overnight without actual battery drain.

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?

There are two main explanations for EV range loss when parked: The car used electricity while parked, or its estimate of how far you can drive changed. Typically, both happen together. And the basics of how this happens can help you better predict and manage range loss, for example while your EV is parked for longer periods.

First, lets look at how EVs predict range . It’s an estimate, not an exact measurement of how many miles the remaining charge can deliver. The latter would be impossible, since lots of factors can impact range, like how heavy your right foot is or if you decide to climb a steep incline.

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