Tesla’s electric vehicles are renowned for their impressive performance and long battery life. However, some owners have reported an issue with their Tesla losing charge when parked.
This phenomenon has caused frustration and concern among Tesla owners, and it has led to many questions about why this occurs.
There could be several reasons why your Tesla is losing charge when parked. Some of the most common reasons include:
- Battery drain: Your car’s battery can lose charge if it’s left in a parked state for an extended period. This is because the battery is still powering systems like the car’s computer and alarms.
- Sentry mode: If your Tesla is in sentry mode, it uses more power to keep the cameras and sensors active. This can cause your battery to drain faster than normal.
- Extreme temperatures: If your car is parked in extreme temperatures, such as very hot or cold weather, it can cause the battery to lose charge more quickly.
- Battery degradation: Over time, all batteries lose their capacity to hold a charge. If your Tesla’s battery is degraded, it may lose charge more quickly than it used to.
To prevent your Tesla from losing charge when parked, you can try the following:
- Turn off sentry mode: If you’re not using sentry mode, turn it off to save power.
- Keep the battery charged: Make sure to keep your Tesla’s battery charged, especially if you’re not planning to use it for an extended period.
- Park in a cool, shady spot: If possible, park your Tesla in a cool, shady spot to avoid extreme temperatures.
- Check for software updates: Tesla regularly releases software updates that can improve battery efficiency and reduce power usage. Make sure to keep your car’s software up to date.
In this article we’ll cover:
- Why do Tesla’s lose charge when parked?
- Battery drain and sentry mode
- Tesla battery drain and temperature
- Battery degradation over time
- Software and battery drain
- How to prevent Tesla battery drain while parked
Why do Tesla’s lose charge when parked?
First, it’s essential to understand that all electric vehicles, including Tesla’s, have a battery drain issues. When you park your electric car, it still needs to power various systems such as the alarm, keyless entry, and even the infotainment system. These systems run continuously, and even though they don’t consume a lot of power, they can add up over time, leading to a noticeable decrease in the car’s battery level.
Ambient temperature can also have an impact. If it’s been cold overnight or the the temperature drops this can cause the battery drain to be more noticeable as your range will drop anyway due to the cold temps. Equally, if your car has been standing in the sun and the car may have had to run its battery cooling systems to keep the pack safe and healthy.

Battery drain and Sentry Mode
One of the most common reasons for battery drain is Tesla’s “sentry mode.” This feature was designed to provide additional security to parked vehicles by activating the car’s cameras and sensors.
While this feature is useful, it uses a considerable amount of power and can result in a noticeable decrease in battery charge. Sentry mode is enabled by default, so if you’re not using it, it’s best to turn it off to avoid unnecessary battery drain.
Tesla losing charge while parked and temperature
Another reason why Tesla’s lose battery charge while parked is extreme temperatures. Lithium-ion batteries, which are commonly used in electric cars, are sensitive to temperature changes.
If your car is parked in a hot or cold environment, the battery’s performance can be affected, leading to a decrease in charge level. If you’re parking your Tesla in extreme temperatures, it’s best to park it in a cool, shaded area to reduce the effects of temperature fluctuations.

Battery degradation over time
Additionally, Tesla’s batteries can degrade over time, causing them to lose their ability to hold a charge. If your car’s battery is old or has been used frequently, it may lose charge more quickly than a new battery. Battery degradation is an unavoidable issue that affects all electric cars, and it’s important to keep in mind when purchasing an electric vehicle.
Software and battery drain
Another factor that can contribute to battery drain is the car’s software. Tesla regularly releases software updates that can improve battery efficiency and reduce power usage. If you’re experiencing excessive battery drain, it’s essential to ensure that your car’s software is up to date to take advantage of these improvements.

How to prevent your Tesla losing charge while parked
To prevent excessive battery drain while parked, there are several steps you can take. First, it’s essential to keep your car’s battery charged. If you’re planning to park your Tesla for an extended period, it’s best to ensure that it’s fully charged before doing so. You can also set up charging schedules to ensure that your car is charging during off-peak hours, which can help reduce your overall energy costs.
Another way to reduce battery drain is to turn off unnecessary features when parked. If you’re not using sentry mode or other features that use a considerable amount of power, it’s best to turn them off to save battery life. Additionally, you can adjust your car’s climate settings to reduce energy usage while parked.
It’s important to note that while some battery drain is unavoidable, excessive battery drain may indicate a problem with your car’s battery or software. If you’re experiencing significant battery drain while parked, it’s best to contact Tesla’s customer support team for assistance.

In conclusion, while Tesla’s electric vehicles are known for their impressive performance and long battery life, they are not immune to battery drain while parked. Several factors can contribute to battery drain, including sentry mode, extreme temperatures, battery degradation, and software issues.
To prevent excessive battery drain, it’s essential to keep your car’s battery charged, turn off unnecessary features, and park in a cool, shaded area. By taking these steps, you can ensure that your Tesla is ready to go when you are and avoid unexpected battery issues.