Genius Asian How To Remove A Badly Corroded Car Battery, Replace With New
How to Remove a Badly Corroded Car Battery and Replace It
Key Takeaways
- Badly corroded battery terminals can make removal extremely difficult
- Always disconnect the negative terminal first and reconnect it last to prevent short circuits
- Baking soda and water solution neutralizes and cleans battery acid corrosion
- Wire brush the terminals and cable clamps to ensure good electrical contact with the new battery
- Applying petroleum jelly or terminal protectant to the new connections prevents future corrosion
Dealing With Severe Corrosion
A badly corroded car battery is more than an eyesore — the corrosion buildup on the terminals and cable clamps can prevent proper electrical contact, cause starting problems, and make battery removal a frustrating challenge. The crusty, blue-green deposits are dried battery acid that has leaked or gassed from the battery, and they can fuse the cable clamps to the terminals.
Safe Removal Process
Safety first: Wear gloves and eye protection. Battery acid is corrosive and the corrosion itself can irritate skin and eyes. Work in a ventilated area since batteries can release hydrogen gas.
Disconnect negative first: Always remove the negative (black) cable first. This prevents accidental short circuits if your wrench touches the car body while removing the positive terminal.
Break the corrosion bond: If the clamps are fused to the terminals, use a battery terminal puller or carefully work a flat screwdriver between the clamp and terminal. Do not pry against the battery case, which can crack and leak acid.
Neutralize the corrosion: Mix baking soda with water to create a paste. Apply it to all corroded surfaces. The baking soda neutralizes the acid, and the fizzing reaction breaks up the deposits. An old toothbrush helps scrub the residue away.
Installing the New Battery
Clean the cable clamps thoroughly with a wire brush before connecting to the new battery. Connect positive first, then negative. Apply petroleum jelly or battery terminal protectant spray to the connections to inhibit future corrosion.