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.
positive to positive
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, 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.
negative to positive,electrons to protons
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.
It is almost always imprinted on the battery next to the posts. If not the positive + post is slightly larger than the negative - post.
Connect a battery charger to battery positive to positive negative to negative
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.
The cathode is the positive terminal in a battery.
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.