What are the five wires on the charging head of the old record player?

For 5 sockets. Two thick red and black lines are the positive and negative poles of the power supply, and the other three lines are signal detection lines to judge whether the battery voltage is too low or too high, which plays a role in protecting the battery. The charger charges, the positive pole is connected with red line, and the negative pole is connected with black line. So you can charge it. Two batteries are combined together, so these five wires have two red positive wires, two negative wires and a temperature sensor wire to detect the battery temperature. The record player for the elderly is specially made for the elderly to listen to opera or dance square dance.