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When connecting your battery, connect the positive (red) first and the negative (black) second. When removing the battery, disconnect the negative (black) first and the positive (red) second. Been doing this for nearly 30 years. ALWAYS connect the positive post first.
If your battery is grounded on the negative side, as most are, you should first attach the positive cable to the positive battery terminal, then the negative cable to the frame of the car. If it is grounded on the positive side, attach the negative cable to the negative terminal and the positive cable to the frame.efore using the charger, make sure it is plugged in to an outlet that is grounded. Car batteries are grounded to the frame of the car to reduce the risk of a spark occurring near the battery when connecting to a charger, which could cause an explosion.