Well the flat of the battery is the negative side.
If you have a post battery(the cable attaches from the top) the positive post is larger than the negative.
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.
positive to positive
Positive to positive, negative to negative if you are asking about installing one battery in a vehicle.
Energy flows from the negative terminal to the positive terminal of a battery.
It is almost always imprinted on the battery next to the posts. If not the positive + post is slightly larger than the negative - post.
What happens when you inadvertently crossed the positive battery terminal from a negative to a positive and a positive to a negative.?Read more: What_happens_when_you_inadvertanly_crossed_the_positive_battery_terminal_from_a_negative_to_a_positive_and_a_positive_to_a_negative.
negative to positive,electrons to protons
Connect a battery charger to battery positive to positive negative to negative
The quickest and best way is to look at the battery. If your positive cable (+) is going to the frame or body, positive ground. If the negative (-) goes to the frame or body, negative ground. I believe that a MF 35 is a neg ground system but use the check from above.
The positive battery cable will be going from the positive terminal of the battery over to the starter solenoid. The negative battery cable goes from the negative battery post to either a bolt on the generator upper bracket or the side of the engine block. Typically, the positive cable is red, and the negative is black, but people do all sorts of odd things to their cars, like have the wrong colored battery cables, so, go by how they are routed, not by what they look like.
The positive end of a battery goes to the positive end of the terminal. In retro spec, the negative end of a battery goes to the negative end of the terminal.