Charging device, charging system and charging method

A charging system comprising:

• a charging device that charges a plurality of secondary batteries that supply electric power to a portable radiation imaging device, each of the second batteries being able to be installed in or removed from the portable radiation imaging device;
• a detecting unit that detects an extent of deterioration of each of the plurality of secondary batteries;
• a selecting unit that selects a secondary battery to be installed in the portable radiation imaging device such that, the smaller a planned number of images to be captured by the portable radiation imaging device, the higher the frequency of selection of a secondary battery, whose extent of deterioration is high, becomes;
• and
• an indicating unit that indicates the secondary battery selected by the selecting unit.

A method of selecting a secondary battery in a charging device that charges a plurality of secondary batteries that supply electric power to a portable radiation imaging device, each of the second batteries being able to be installed in or removed from the portable radiation imaging device, the method comprising:

• detecting an extent of deterioration of each of the plurality of secondary batteries;
• selecting a secondary battery to be installed in the portable radiation imaging device such that, the smaller a planned number of images to be captured by the portable radiation imaging device, the higher the frequency of selection of a secondary battery, whose extent of deterioration is high, becomes;
• and
• indicating the secondary battery that was selected.