Starting System & Charging System (WRX-STI): Battery: Inspection: Appearance

Check the battery case, top cover and terminal posts for dirt or cracks, and perform the following work as necessary.

• Clean the battery with water and wipe with a dry cloth.
• Apply a thin coat of grease on the terminal posts to prevent corrosion.

Check 

• Normal → Go to ELECTROLYTE LEVEL below. 
• Abnormal → Replace the battery.