Question

when installing a battery which post should be connected first on a battery? positive either - no difference depends on battery construction negative

Explanation:

When installing a battery, the positive post should be connected first. This is a standard safety practice in electrical work. Connecting the positive post first helps minimize the risk of accidental short - circuits. If the negative post were connected first and then the positive, there is a higher chance of creating a short circuit if the tool or cable accidentally touches a metal part of the vehicle (which is usually connected to the negative terminal).

Answer:

Positive