Step 1: Gather Necessary Materials

• Replacement battery: For a 2018 Toyota RAV4 key fob, you typically need a CR2032 battery.
• Small flat-head screwdriver or a similar tool (like a small butter knife).

Step 2: Open the Key Fob Case

• Locate the seam where the two halves of the key fob housing meet.
• Use the flat-head screwdriver to gently pry apart the halves. Be careful to avoid damaging the plastic.
• Start at the indentation or small notch on the side of the fob and slowly twist the screwdriver to separate the halves.

Step 3: Remove the Old Battery

• Once the key fob is open, locate the battery compartment.
• Carefully lift the old battery out of its slot. You may need to use the screwdriver to gently pop it out if it’s snug.

Step 4: Insert the New Battery

• Take the new CR2032 battery and insert it into the battery slot with the positive side (the side with the writing) facing up.
• Ensure that the battery is seated securely in the compartment.

Step 5: Reassemble the Key Fob

• Align the two halves of the key fob casing and press them together firmly until they snap back into place.
• Ensure all edges are properly aligned and there are no gaps.

Step 6: Test the Key Fob

• Once the fob is reassembled, stand near the vehicle and press any button on the fob to ensure it’s working properly.
• If the fob doesn’t work, check that the battery is properly seated and oriented the correct way.

These steps cover the typical process for replacing the battery in a key fob for a 2018 Toyota RAV4. Always refer to the owner’s manual for specific instructions related to your vehicle.