Red
red
Red wire is Positive in a car battery. If they are not color coded, find which one is not connected to the chassis and this will be positive.
Positive is normally red.
red
The post is just lead, gray color. The cable is sometimes colored red. The battery could also have a "+" symbol to mark positive.
The positive battery cable is red.
Black is negative and Red is positive.
Negative plates in the battery are naturally this dark color. A short between plates causes a discharge or equalization in potential which more or less is changing the positive plates and post to the color of the negative. The battery will become useless.
Positive is either red or has a "+" symbol.
The tip on the plus side of a battery is called the positive terminal. It is usually marked with a plus sign or the color red to indicate the positive polarity of the battery.
The positive wire on most batteries is red. If both are black, look for the positive sign by the electrode.
When charging a car battery, the red positive cable should be connected first.