Portable electronic system equipped with a spare battery device

A portable electronic system at least comprising:

• a spare battery device, at least comprising:
• a first fixer unit;
• a power storage unit for storing power;
• and
• a sensory control unit coupled to the power storage unit, wherein the sensory control unit at least comprises:
• a constant voltage source;
• a resistor, coupled to the constant voltage source;
• a resilient object coupled to the resistor at a first node, and protruding out from the spare battery device, wherein the resilient object is an electric, and
• a control unit coupled to the resistor and the resilient object at the first node, coupled to the power storage unit, and equipped with a plurality of output contact pads for outputting power from the spare battery device;
• and
• a portable device, coupled to the spare battery device, at least comprising:
• a second fixer unit coupled to the first fixer unit, for fastening the spare battery device to the portable device;
• a covering being electrically conductive, wherein the covering further comprises a protrusion and the location of the protrusion on the portable device is associated with the location of the resilient object of the spare battery device;
• and
• a plurality of input contact pads for receiving power from the spare battery device, wherein the location of each of the output contact pads on the spare battery device is associated with the location of each of the input contact pads of the portable device.
• wherein, by adjusting the coupling relationship between the first fixer unit and the second fixer unit, the resilient object can be connected with the protrusion, and each of the output contact pads of the spare battery device is coupled to the associated input contact pads of the portable device, and the control unit is for controlling the output power of the power storage unit according to the voltage of the first node.