Kia Optima Hybrid Owner's Manual Quiz
Engine Electrical System

12 V Auxiliary Battery Repair Procedures

In this manual: Engine Electrical System
General Information — 4Engine Mechanical System — 50Engine Electrical System — 20Emission Control System — 30Engine Control System/Fuel System — 84Automatic Transmission — 98Drive Shaft and Axle — 15Suspension System — 36Steering — 12Restraints — 50Brake System — 38Body (Interior and Exterior) — 54Body Electrical System — 233Heating, Ventilation, and Air Conditioning — 57
22steps
~132min
4/5difficulty
010203040509.87N·mlb·ft
Tightening torque found on this page
Done 0 of 22

Removal and Installation

  1. First, disconnect the negative battery cable (B), then the positive battery cable (A). Tightening torque: (+) terminal (A): 7.8 ~ 9.8 N·m (-) terminal (B): 4.0 ~ 6 N·m
  2. Disconnect the vent hose (C).
  3. Remove the battery upper bracket (A), then remove the 12 V auxiliary battery (B).

    Tightening torque: 19.6 - 29 N·m

  4. Remove the battery tray (A).

    Tightening torque: 19.6 - 29 N·m

  5. Installation is the reverse of removal.
    Install the battery upper bracket after positioning the battery closest to the side panel.

Inspection

Battery Diagnosis Flow
Vehicle Parasitic Current Check
  1. Turn off all electrical devices, then turn the ignition off.
  2. Close all doors except the hood, then lock all doors.
    1. Disconnect the hood switch connector.
    2. Close the liftgate.
    3. Close the doors.
  3. Wait several minutes until the vehicle electrical systems go into sleep mode.
    For an accurate measurement of the vehicle parasitic current, all electrical systems must go into sleep mode (at least one hour, or up to one day). However, an approximate vehicle parasitic current can be measured after 10 to 20 minutes.
  4. Connect the ammeter in series between the battery negative (-) terminal and the ground cable, then slowly disconnect the ground cable from the battery negative (-) terminal.
    Be careful that the ammeter lead wires do not come off the battery negative (-) terminal and the ground cable, to prevent the battery from discharging. If the battery is discharged, connect the battery cable, then start the engine or turn the ignition on for more than 10 seconds. Repeat the procedure from step 1. To prevent battery discharge during inspection,
    a. Connect the jumper cable between the battery negative (-) terminal and the ground cable.
    b. Disconnect the ground cable from the battery negative (-) terminal.
    b. Connect the ammeter between the battery negative (-) terminal and the ground cable.
    d. After disconnecting the jumper cable, read the ammeter current value.
  5. Read the ammeter current value.
    • If the parasitic current exceeds the limit value, search for the abnormal circuit by removing fuses one at a time and checking the parasitic current.
    • Reconnect the fuse of the suspected parasitic current draw circuit. Find the suspect device by removing the components connected to the circuit one at a time until the parasitic draw drops below the specified limit.

    Specified limit (after 10 to 20 min.): Below 50 mA

Cleaning the 12 V Battery Area

  1. Make sure the ignition switch and all accessories are in the OFF position.
  2. Disconnect the battery cables (negative terminal first).
  3. Remove the battery from the vehicle.
    Use caution if the battery case is cracked or leaking to protect skin from electrolyte. Wear tight-fitting rubber gloves (not household gloves) when removing the battery.
  4. Inspect the battery tray for damage caused by electrolyte leakage. If acid damage is present, clean the area with a solution of clean warm water and baking soda. Scrub the area with a stiff brush and wipe with a cloth dampened with baking soda and water.
  5. Clean the top of the battery with the same solution described above.
  6. Inspect the battery case and cover for cracks. If cracks are found, the battery must be replaced.
  7. Clean the battery terminals with a suitable tool.
  8. Clean the inside surfaces of the battery terminal clamps using a suitable battery terminal cleaning tool. Replace damaged or worn cables and broken terminal clamps.
  9. Install the battery in the vehicle.
  10. Connect the cable terminals to the battery post, making sure the tops of the terminals are flush with the tops of the posts.
  11. Tighten the terminal nuts securely.
  12. After tightening, apply light mineral grease to all connections.
    Explosive gas is generated under the cap of each cell while batteries are charging. Do not smoke near batteries that are being charged or have recently been charged. Do not break a live circuit at the terminals of batteries being charged. Breaking the circuit causes a spark. Keep open flames away from the battery.

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