Corroded battery terminals (white or blue crust)

Likely causes

• Gas venting from the battery over time
• Battery leaking acid from age or damage
• Overcharging from the charging system
• Loose clamps letting moisture and acid build up
• Heat speeding up the reaction

Try this first

• Keep bare hands off the crust, and don't rub your eyes after being near it
• Keep flames, cigarettes and sparks away from the battery
• Check whether the dash lights come on, which shows if any power is getting through
• Note whether the battery case looks swollen, cracked or wet

When to call us

• The car won't start and you can see corrosion
• The battery case is swollen, cracked or leaking
• The corrosion keeps coming back after being cleaned