Wireless Broadband Device

A wireless broadband device, comprising:

• a main body;
• and
• an end cover,
• wherein the main body and the end cover are assembled to form a whole,
• wherein the main body carries a first battery, which is configured to supply power to a circuit of the main body, to enable the main body to implement a wireless broadband function,
• wherein the end cover is internally disposed with a second battery,
• wherein a power output contact of the second battery emerges from an inner side of the end cover,
• wherein the inner side of the end cover contacts the main body,
• wherein the power output contact of the second battery contacts an exposed power input contact point of the circuit of the main body, and
• wherein the circuit of the main body switches to the second battery for power supply when an output voltage of the first battery is smaller than a minimum required voltage for supplying power to the circuit of the main body.