Wireless mobile battery

A charging device for wirelessly charging an electronic device having a wireless power receiver antenna, the charging device comprising:

• a battery having a front surface and a back surface;
• a first antenna positioned in front of the front surface, the first antenna comprising a dual-mode antenna, the first antenna configured to wirelessly transmit power and to wirelessly receive power;
• a housing surrounding the battery, the first antenna, and a coupling portion,
• the housing having a front contact surface and a rear surface, the coupling portion positioned in front of the front surface and configured to couple the charging device with the electronic device, the coupling portion being closer to the contact surface than the rear surface,
• the first antenna being closer to the contact surface than the rear surface.

A system comprising:

• a charging device having:
• a device battery having a front surface and a back surface,
• a front antenna closer to the front surface than the back surface of the device battery, the front antenna comprising a dual-mode antenna, the front antenna configured to wirelessly transmit power and to wirelessly receive power,
• a charging device housing surrounding the device battery and the front antenna,
• the charging device housing having a front contact surface and a rear surface, and
• a smartphone coupling portion closer to the front contact surface than the rear surface of the housing, the smartphone coupling portion configured to magnetically couple the charging device with a corresponding coupling portion of a smartphone,
• wherein the front antenna is closer to the front contact surface than the rear surface;
• and
• a smartphone having a smartphone battery, the smartphone also having a smartphone antenna configured to receive power wirelessly, the smartphone battery and the smartphone antenna being within a smartphone housing, the smartphone housing having a smartphone surface nearest to the smartphone antenna, the smartphone having the corresponding coupling portion configured to magnetically couple with the coupling portion of the charging device.