What is the difference between blue and red labels on car batteries?

1 Answers
AveryLee
07/29/25 10:01pm
The difference between blue and red labels on car batteries lies in the plates used in the battery: The red label on the battery terminal indicates the positive pole of the battery, while the blue label indicates the negative pole. Manufacturers label them this way to help car owners better distinguish between the positive and negative poles of the battery. Symbols for positive and negative poles are also marked near the battery terminals. The battery charge indicator, also known as the "eye," displays black when the battery needs charging, green when it is in good condition, and white when the electrolyte is insufficient and needs replacement. If the indicator shows black, the battery requires charging and has already experienced over-discharge. The charging capacity from the car itself is insufficient, and only a charger can be used to charge the battery. It takes about 20 hours to fully charge a car starting battery.
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