Tesla Model S Owners & Service Manuals

Tesla Model S: Starting/Discharging the System

Tesla Model S (2012-2025) Service Manual / Battery System / HV Battery Charge/Discharge - 3rd Generation Tool (Out of Vehicle) / Starting/Discharging the System

Starting the System

  1. Press the emergency stop button to disable HV systems.
  2. Pull out the display/keyboard/trackpad tray.
  3. Press the red power button to turn on the on-board PC.
  4. Follow the onscreen instructions to log in to the system.
    Username: batterytool
    Password: Tesla1234
    Domain: CHGDCH-PC#
    Note: The username and password are case-sensitive. Enter the username and password as shown above.

    Note: Do not set the domain to TESLAMOTORS.

  5. Launch the Tesla Charger/Discharger GUI application from the Start menu or the shortcut on the desktop. The HV battery serial number, SOC, and shipping bit status are shown.

    Starting the System

Discharging the Battery
  1. Select the desired SOC from the Charge/Discharge Mode menu.

    Discharging the Battery

  2. If Manual Mode is selected, type the desired SOC in the Target SOC% field, or drag the Target SOC% knob to the desired SOC.
  3. Ensure that the 115V/230V selector switch on the discharger box is set to the appropriate voltage for the location. Caution: Do not change the 115V/230V selector switch while the discharger box is powered on.
  4. Set both of the load bank enable switches to the off position. The load bank is controlled by the charger/interface control box.
  5. Release the emergency stop button by turning the knob counter-clockwise.
  6. Select the Start button in the software application. The Start button changes to a Stop button.
  7. The battery contactors close and discharging begins. The pack current, discharging indicator, and estimated hours remaining display on the right side of the window.

    Discharging the Battery

  8. When the target SOC is reached, the tool automatically stops the discharging operation and opens the contactors. The discharging operation can be manually stopped by pressing the Stop button in the software application. Note: The emergency stop switch on the charger/interface box can be used to immediately open the contactors in an emergency. Do not press the emergency stop switch except in an emergency, as it opens the contactors under load and disconnects power to the BMS, causing the Charger/Discharger Tool to lose communication with the BMS.
  9. When the operation is complete, make sure the contactor state is "Open", then engage the emergency stop switch.
  10. Wait until the voltage displayed on the HV DC Link Voltmeter is less than 5V, then shut down the PC.

    Discharging the Battery

  11. Turn off all powered components.
  12. Disconnect the HV battery.

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