High Voltage Battery Health

Note

Your vehicle may not be equipped with the Battery Health Test feature.

The high voltage Battery in Model Y is designed to perform well over the entire lifetime of the vehicle. Like any rechargeable battery, however, it becomes less effective over time due to aging and usage. The energy retention of the Battery depends on a number of factors such as age, Battery pack size and chemistry, and how you drive and charge your vehicle.

For an evaluation of the Battery's energy retention, touch Controls > Service > Battery Health.

The touchscreen displays an evaluation of your vehicle's Battery health, calculated using data from the Battery management system and comparing it to expected energy retention for the given battery type, age, and usage.

Optionally, you can run the Battery Health Test, which requires Model Y to be connected to an AC charger for up to 24 hours. After you run the test, Model Y provides a percentage that reflects the energy retention of your vehicle's Battery compared to when it was new.

Note

This feature requires that Model Y be connected to Wi-Fi or a cellular network.

Note

Tesla recommends using the Battery Health Test only if there is a concern about the energy retention of the high voltage Battery.

Running the Battery Health Test

To start the test, Model Y needs to be plugged in to an AC charger that provides at least 5 kW of power.

In addition, make sure that all of the following requirements are met before you begin the test.

There are no active alerts related to the Battery or thermal system.
Model Y is in Park.
There are no pending software updates.
There is less than 20% Battery level remaining.

When you are ready to begin the test:

Plug in your vehicle to an AC charger.
Touch Controls > Service > Battery Health Test. Read the popup, then touch Start Test.

The test takes up to 24 hours to run. While the test is running, the touchscreen displays a progress bar and the estimated time remaining. The touchscreen will be off for certain portions of the test, the Battery will be discharged below 10% (and may be discharged as low as 0%), and vehicle features (such as Sentry Mode and climate controls) are disabled.

Warning

Climate control systems are disabled while the Battery Health Test is running. Do not leave occupants unattended in the vehicle while the test is running.

CAUTION

Avoid interacting with Model Y or the Tesla mobile app during the test. You can cancel the test on the vehicle's touchscreen or mobile app at any time. In the event that the test fails or you cancel the test, your vehicle will attempt to begin charging to the set charge limit.

CAUTION

Do not unplug Model Y while the test is running. If you need to unplug Model Y, first cancel the test on the touchscreen. You can cancel the test at any time.

Note

While the test is running, Model Y may produce heat and loud noises (such as the fan running at high speed). This is normal and is not a cause for concern.

Understanding Results

Once the Battery Health Test is complete, the touchscreen displays a percentage that represents a comparison of your Battery's energy retention to when it was new, and the range estimate shown on the touchscreen may be recalibrated.

When a data connection is available, Model Y can determine whether the energy retention is as expected based on the vehicle's delivery date and mileage. If the energy retention of the Battery is affecting the usability of your vehicle, schedule a service appointment.

After the test has been completed, the Battery Health Test will be unavailable until the Battery management system detects that there has been a change in your vehicle's Battery sufficient enough to be measured by a new test.