Charging device and charging method

A charging apparatus for charging a secondary battery when mounting an apparatus having a built-in secondary battery on a battery charger, the charging apparatus comprising:

• the battery charger comprising an engaging section and a contact member;
• and
• an electrode for supplying power to the secondary battery upon establishing contact between an engaged section engaging with the engaging section and the contact member, wherein
• when the apparatus is mounted on the battery charger so as to engage the engaged section with the engaging section, the electrode is press-attached against the contact member with a force greater than a weight of the device due to an angular moment centered about the engaging section of the apparatus due to the weight of the apparatus, and
• a receptacle surface of the battery charger forms a substantial circular arc shape wherein the engaged section is engaged by the engaging section when the apparatus is turned on the receptacle surface, and the electrode stops at a position where contact is made with the contact member.