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The battery system of the Model Y is one of the most advanced in the world. When you are not using your vehicle, the most important technique to conserve the battery is to LEAVE IT PLUGGED IN. This is especially critical if you won't be driving the Model Y for several weeks. When the Model Y is plugged in, it wakes up as needed to maintain a charge level that extends the Battery's life.
Note: When your car is unplugged and left idle, it takes energy from the Battery to run system tests and recharge the 12V battery as needed. Waiting till the Battery's level is low before charging has no benefit. In fact, the Battery works best when it is charged on a regular basis.
Note: Other components (for example, the 12V battery) may get damaged or require replacement if you allow the Battery to deplete to 0%. You are liable for any repair and/or transportation costs in these situations. The warranty and the Roadside Assistance coverage do not cover discharge-related expenditures.
After a significant number of DC Fast Charging sessions, such as those at Superchargers, the Battery's peak charging rate may fall slightly. When the Battery is excessively cold, when the charge is nearly full, or when the Battery conditions vary with usage and age, the Battery charge rate is reduced to ensure optimal driving range and Battery safety. These changes in the battery's status are caused by physics, and they may lengthen the entire Supercharging time by a few minutes over time.
Allowing the battery to entirely deplete is never a good idea.
Even when the Model Y is not in use, the battery slowly declines to power the inbuilt circuits. The Battery can discharge at a rate of about 1% each day, while this varies based on ambient factors (such as cold weather), vehicle design, and the settings you choose on the touchscreen. There may be times when you need to leave your Model Y unplugged for a lengthy period of time (for example, while going through an airport). In these cases, remember to leave the Battery with an adequate charge level by remembering the 1% rule. For example, over a two week period (14 days), the Battery may discharge by approximately 14%.
Vehicle components may be damaged if the battery is discharged to 0%. When the indicated charge level decreases to about 0%, Model Y enters a low-power consumption mode to protect against a complete discharge. The Batteries stops supporting the onboard electronics and the supplementary 12V battery in this mode. To avoid a jump-start and 12V battery replacement, plug in Model Y as soon as this low-power consumption mode is activated.
Note: The 12V battery may have become discharged if the vehicle is unresponsive and will not unlock, open, or charge. Contact Tesla if you find yourself in this circumstance.
Avoid exposing the Model Y to temperatures exceeding 140° F (60° C) or below -22° F (-30° C) for more than 24 hours at a time for improved long-term performance.
WARNING: There are no parts on the Battery that can be serviced by an owner or a non-Tesla approved service specialist. Under no circumstances should the Battery be opened or tampered with. Always contact Tesla to schedule battery maintenance.
Caution: You must plug the battery in if the charge level falls below 0%. It may be impossible to charge or operate Model Y without jumping starting or replacing the 12V battery if you leave it unplugged for an extended period of time (see Instructions for Transporters for how to jump start the battery). Battery damage can occur if the Model Y is left unplugged for an extended period of time. If you're having trouble charging your Model Y, contact Tesla right away.
Caution: The Battery does not need to be maintained by the owner. Remove the coolant filler lid before adding fluid. If the touchscreen indicates that the fluid level is low, call Tesla right away.
Caution: Do not use the battery as a portable power source. The warranty will be voided otherwise.
Tesla, Inc. was not involved in the development of this document and did not provide any input or otherwise edit, review or authorize it.