How to Refill a Car Battery in 2 Simple Parts

How to Refill a Car Battery in 2 Simple Parts. Refilling your car battery with distilled water can extend its lifespan and restore its power. Follow these step-by-step instructions to safely check and refill your car battery.

Part 1: Checking the Water Levels

Step 1: Put on Protective Eyewear and Gloves

• Wear safety glasses or goggles and gloves to protect your eyes and hands from battery acid.
• Ensure the car is turned off before working on the battery.

Step 2: Identify the Battery Type

• Check the labels on your battery. If it says “DO NOT OPEN” or “Maintenance-Free,” do not attempt to refill it.

Step 3: Remove Cell Port Covers

• Rectangular Covers: Pry them off gently with a flat-head screwdriver.
• Round Covers: Twist each cover counterclockwise to remove them.
• These covers protect 6 internal cells.

Step 4: Clean the Battery Surface

• Wipe the battery around the cell ports with a damp rag to remove dirt and debris. This prevents contamination during refilling.

Step 5: Inspect Water Levels

• Look inside each cell port for the metal plates. If plates are visible, the water level is too low.
• Normal water levels should be about 3/4 of the way below the top of the cell.

Part 2: Adding Water

Step 1: Fully Charge the Battery

• Charge the battery using a charger or run the car for 30 minutes to ensure accurate water levels.

Step 2: Use Distilled or Deionized Water

• Only use distilled or deionized water to prevent mineral buildup.
• Never use tap water or sulfuric acid, as these can damage the battery.

Step 3: Refill with a Turkey Baster or Funnel

• Use a turkey baster or funnel to add water to each cell.
• Slowly pour enough water to cover the exposed metal plates, but do not overfill. The ideal water level is about 3/4 below the top of the cell.
• If overfilled, remove excess water with a turkey baster.

Step 4: Secure the Cell Port Covers

• Replace the caps firmly, ensuring they are tight and secure.
• Snap rectangular caps into place or twist round caps clockwise.

Tips and Warnings

• Safety First: Work in a well-ventilated area to avoid inhaling fumes.
• Regular Maintenance: Check water levels every few months, especially in hot climates.
• Avoid Overfilling: Leaks from overfilled cells can cause corrosion.
• Dispose Properly: Discard excess water safely.

By maintaining proper water levels in your car battery, you can extend its performance and longevity while avoiding costly replacements.