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a car electric battery jumper lead is actually shown, that is made up of the exchange switching circuit eleven, an initial voltage mutual opposition recognition signal 12, a second voltage
 mutual opposition acknowledgement signal 13, a reasoning recognition circuit fourteen, the driving signal 15, along with a power signal 16. The actual exchange changing circuit 11 is connected to the positive and negative terminals of a first power supply device twenty one through the 2 ends 1111 and 1112 of the very first present music director pair 111, and
attached to the positive and negative rods of a second power provide device 22 through the two ends 1121 and 1122 of the second current conductor pair 112. If the very first power supply device twenty one is an efficient power supply, the second power supply device twenty two will be a battery to become rescued. On
the contrary, if the very first power gadget 21 is really a electric battery to become saved, the 2nd power supply gadget 22 shall be an effective power source. By way of the connection of the relay switching signal eleven between the first power device twenty one and the square provide gadget 22, the
 good and bad rods of the energy source, which is commonly a battery, are accurately combined to the battery to become rescued, allowing the strength of the power supply for use to begin the vehicle (not shown)