Replacing the Low Voltage Lead-Acid Battery

This procedure is intended for vehicles in North America only.
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CAUTION
To avoid damage that is not covered by the warranty, replace your low voltage lead-acid battery with the same type of battery. The low voltage lead-acid battery for North American vehicles is AtlasBX / Hankook 85B24LS 12V 45Ah. You can purchase a new lead-acid low voltage battery that is compatible with your vehicle from your local service center.

Perform the following procedure to replace the lead-acid low voltage battery. Wear appropriate personal protection equipment (such as safety glasses, leather gloves when handling the lead-acid battery, etc.).

Removal:

  1. Prepare the vehicle to remove the low voltage lead-acid battery:
    1. Ensure the vehicle is in Park.
    2. Lower all windows.
    3. Open the front trunk.
    4. Leave a door propped open so you can get back into the vehicle if needed.
    5. Disconnect the charge cable from the charge port.
  2. In the front trunk, remove the vehicle’s underhood apron by inserting a small, non-marring flat tool or your fingers underneath the panel. Pull up to loosen the clips and set the underhood apron aside.
    Image of vehicle with front trunk open and rear underhood apron highlighted
  3. If equipped, remove the HEPA filter:
    1. Using a 10mm socket, remove the bolt that attaches the washer fluid reservoir neck to the underhood storage unit.
      Closeup of bolt that attaches washer fluid reservoir neck to the underhood storage unit
    2. Remove the washer tank neck from the vehicle. If the windshield washer reservoir is full, some washer fluid may leak out.
      Informational PurposesAn informational icon, calling your attention
      Note
      You do not need to remove the hose from the neck.
      Closeup of tabs that hold washer tank neck in place
    3. With a 10mm socket, remove the bolts (x2) that attach the HEPA filter assembly to the vehicle.
      Highlighted bolts (x2) on HEPA filter assembly
    4. Remove the HEPA filter assembly from the vehicle by tilting the rear edge of the filter assembly up past the brake fluid reservoir. Lift the filter assembly out of the vehicle, taking care not to bump into or damage other components.
      Image showing HEPA filter assembly being removed by lifting it up and out of vehicle
  4. Power off the vehicle by navigating to Controls > Safety > Power Off on the touchscreen.
  5. Disconnect the first responder loop by sliding the red locking tab toward you and pressing the black tab.
    Arrow showing first responder loop being disconnected
  6. With a 10mm socket, loosen the nut that secures the negative (-) terminal clamp to the negative (-) post on the lead-acid battery. Release the terminal clamp from the negative (-) post.
    Closeup of low voltage lead-acid battery with the negative (-) terminal clamp highlighted
  7. With a 10mm socket, release the terminal cover and loosen the nut that secures the positive (+) terminal clamp to the positive (+) post on the lead-acid battery. Release the terminal clamp from the positive (+) post and cover the terminal clamp with a dry rag.
    Warning IconA warning icon, calling your attention to a possibly risky situation
    CAUTION
    Do not allow the positive (+) terminal clamp to contact nearby components like the lead-acid battery hold down bracket or A/C cooling lines.
    Closeup of low voltage lead-acid battery with the positive (+) terminal clamp highlighted
  8. Unplug the vent tube hose from the negative (-) terminal side of the lead-acid battery.
    Closeup of low voltage lead-acid battery with the vent tube hose highlighted
  9. Loosen the nut on the battery hold down on the top of the lead-acid battery with a 10mm socket. To release the battery hold down, unhook and slide the strap back. If needed, tilt the battery hold down backward so it does not slip into the vehicle.
    Arrows show the nut loosening and pulling the hold down up and out
  10. Using the battery handle, carefully remove the lead-acid battery, taking care not to touch or damage the surrounding components.
    Warning IconA warning icon, calling your attention to a possibly risky situation
    Warning
    When lifting out the lead-acid battery, stand in front of the vehicle and use proper lifting technique. The lead-acid battery weighs approximately 25 lb (12 kg). Failure to do so may cause serious injury.
    Example of low voltage lead-acid battery
  11. Inspect the new lead-acid battery to ensure it has a red plug in the casing on the positive (+) terminal side. If the new lead-acid battery does not have a red plug, use a small trim tool to transfer the red plug from the old battery to the new one.
    Warning IconA warning icon, calling your attention to a possibly risky situation
    CAUTION
    Dispose of the old lead-acid battery according to local laws, such as dropping it off at a battery recycling facility. Keep the lead-acid battery upright and place it on a towel or piece of cardboard when transporting it.
    Closeup of low voltage lead-acid battery with the red plug highlighted

Installation:

  1. Carefully maneuver the new lead-acid battery into place, taking care not to touch or damage nearby components.
  2. Install the lead-acid battery hold down and use a 10mm socket to tighten the nut that secures it to the 12V battery. Torque the nut to 6 Nm (4.4 ft-lb).
    Closeup of battery hold down and nut highlighted
  3. Reconnect the first responder loop.
    Arrow shows connecting first responder loop
  4. Remove the protective caps from the positive (+) and negative (-) posts on the new low voltage lead-acid battery.
  5. Connect the positive (+) terminal by positioning the clamp over the positive (+) post. Using a 10mm socket, torque the nut to 6 Nm (4.4 ft-lb).
    Closeup of low voltage lead-acid battery with the positive (+) terminal clamp highlighted
  6. Install the positive (+) terminal cover.
  7. Connect the negative (-) terminal by positioning the clamp over the negative (-) post. Using a 10mm socket, torque the nut to 6 Nm (4.4 ft-lb).
    Closeup of low voltage lead-acid battery with the negative (-) terminal clamp highlighted
  8. Connect the vent tube hose into the negative (-) terminal side of the lead-acid battery.
    Closeup of low voltage lead-acid battery with the vent tube hose highlighted
  9. Open one of the vehicle’s doors to ensure power has been correctly restored and the touchscreen turns on (this may take several minutes).
  10. If equipped, install the HEPA filter:
    1. Carefully maneuver the HEPA fitler assembly into place, taking care not to touch or daramage other components.
      Image showing HEPA filter assembly being reinstalled by setting back into vehicle
    2. With a 10mm socket, tighten the bolts (x2) and torque them to 5 Nm (3.7 ft-lb).
      Highlighted bolts (x2) on HEPA filter assembly
    3. Ensure the O-ring on the washer tank neck is fully seated, then install the washer tank neck by inserting it into the washer tank.
      Closeup of O-ring on washer tank neck with an arrow pointing to the washer tank
    4. Route the hose so that it is secured by the tab.
      Closeup of tabs that hold washer tank neck in place
    5. Use a 10mm socket to install the bolt that attaches the washer fluid reservoir neck to the underhood storage unit. Torque the bolt to 5 Nm (3.7 ft-lb).
      Closeup of bolt that attaches washer fluid reservoir neck to the underhood storage unit
  11. Replace the underhood apron by aligning the clips into their openings in the front trunk. Press down to lock them in place. The clips make an audible clicking sound when secured.
    Image of vehicle with front trunk open and rear underhood apron highlighted
  12. Close the front trunk. If an alert to replace the low-voltage battery was previously shown on the touchscreen, ensure the alert no longer appears.