Question

which post should be disconnected second when removing a battery?
either - no differnece
depends on battery construction
negative
positive

Explanation:

When removing a battery, it is standard practice to disconnect the negative post first. This is to prevent accidental short - circuits. Once the negative is disconnected, the positive post is disconnected second. This is because the positive post is at a higher potential and disconnecting it after the negative minimizes the risk of electrical arcing or short - circuiting to the vehicle's metal components (which are typically grounded, similar to the negative terminal).

Answer:

Positive