Charging system

A charging system comprising:

• a power transfer device;
• and
• a mobile terminal, wherein:
• the power transfer device includes a first power transfer unit being compatible with a first charging standard specifying that the rapid charging battery is to be charged at a predetermined current value;
• and
• the mobile terminal includes:
• a rapid charging battery;
• an internal battery supplying electric power to the mobile terminal;
• and
• a first charging unit being compatible with the first charging standard and configured to charge the rapid charging battery;
• and
• a second charging unit being compatible with a second charging standard specifying that charging is to be performed at a predetermined current value that is lower than the predetermined current value specified by the first charging standard, the second charging unit charging the internal battery from the rapid charging battery.

A rapid charging battery comprising:

• a first charging unit being compatible with a first charging standard specifying that the battery is to be charged at a predetermined current value of higher than or equal to 5 C rate;
• and
• a second power transfer unit being compatible with a second charging standard specifying that power is to be transferred at a predetermined current value that is lower than the predetermined current value specified by the first charging standard, wherein
• the first charging standard is set to permit a current value that is higher than or equal to two times a maximum current value that is permitted by the second charging standard.