The post with the red cable attached to it. The positive post is slightly larger than the negative post. + & - is normally printed on the top of the battery next to the post.
There is no standard for locating the positive or negative posts on a battery. You must look fot the " + " symbol on the battery. The positive post is slightly larger than the negative post.
Positive (Red) to positive post on battery. Negative (Black) to negative post on battery.
Connect the Positive + battery cable to the positive + battery post first. Then connect the Negative - cable to the negative - battery post.
More often than not, the red cable hooks up to the positive post on the battery. There should be a mark on or by each battery post to indicate whether it is the positive (+) or the negative (-) post.
Connect them together in Series. Connect the negative post of one battery to the positive post of the other battery. Then connect the negative charger cable to one negative battery post and the positive to the positive post of the other battery.
First off you must have the same type batteries. Connect the positive post of the first battery to the positive post of the second battery. Then connect the negative post of the first battery to the negative post of the second battery. Now connect the positive post of the first battery to the positive connection on the vehicle. Then connect the negative post of the first battery to the negative cable of the vehicle. Click the link for a diagram.
Change the positive post? You can change the battery with a new one but you cannot just change the post. If you mean reverse the positions of the positive and negative posts then buy a longer battery cable.
red
If you have a post battery(the cable attaches from the top) the positive post is larger than the negative.
Audio battery???? If you mean Auto Battery then Red Positive (+) RED cable goes to Positive (+) post on battery. Black Negative (-) cable goes to Negative (-) post.
It is almost always imprinted on the battery next to the posts. If not the positive + post is slightly larger than the negative - post.
I assume you're asking how can you tell which is positive and which is negative? The red cable is positive in the black cable is negative. But if they are not color-coded the positive battery post is slightly larger than the negative battery post. If you try to connect the negative cable to the positive post it would be a tight fit and if you connect the positive cable to the negative post it would be loose.