Summary:
Battery corrosion is a natural occurrence and usually not a cause for concern. However, excessive buildup can prevent your car from starting, leaving you stranded. Corrosion appears as a bluish-white coating on the terminals, forming due to hydrogen gas escaping from the sulfuric acid in the battery. While unavoidable, it can be managed with proper maintenance.
Causes of Excessive Corrosion
Normally, battery terminals take about three years to develop noticeable corrosion, but excessive buildup may indicate:
- Leaking battery – A cracked casing allows acid to seep out, accelerating corrosion.
- Overheating – High temperatures speed up corrosion; this may signal a faulty cooling system.
- Overcharging or undercharging – Overcharging produces excess hydrogen gas, leading to more corrosion. Undercharging causes corrosion mainly on the negative terminal.
- Old battery – A battery lasts 5–7 years; heavy corrosion could mean it’s no longer holding a charge.
Cleaning Battery Terminals
To remove corrosion:
- Wear protective gear.
- Disconnect the battery, starting with the negative terminal.
- Inspect cables for damage.
- Clean the terminals using a wire brush and a mixture of baking soda and water or a terminal cleaner.
- Reinstall the battery, reconnecting the positive terminal first.
Preventing Corrosion
Apply petroleum jelly or a battery terminal protector to prevent it corroding. Regularly checking your battery, especially as it ages, can help avoid issues.
If corrosion is excessive, uneven (mainly on the negative terminal), or accompanied by a leak or overheating, consult a mechanic. Proper maintenance ensures your car remains reliable and prevents unexpected breakdowns.
Family Handyman
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