Patent ID: 8102150

Claim:
A charging system having an electronic apparatus which has a battery capable of being charged, and a charger which charges said battery in a condition that said electronic apparatus is connected to the charger, said electronic apparatus comprising: a main circuit which is capable of being operable by being supplied with an electric power from said battery; a battery-main circuit power supply switch for conducting ON/OFF of an electric power supply from said battery to said main circuit; said charging system further comprising: a switch control signal producing section for producing a switch control signal which switches ON/OFF of said battery-main circuit power supply switch, dependent on whether or not said electronic apparatus is connected to said charger; wherein; in a condition that said electronic apparatus is removed from said charger, said battery-main circuit power supply switch is switched into ON by said switch control signal, so that an electric power is supplied from said battery to said main circuit; in a condition that said electronic apparatus is connected to said charger, not only said battery is started to be charged by said charger but also said main circuit is started to be supplied with said electric power from said charger, on the other hand, said battery-main circuit power supply switch is switched into OFF by said switch control signal, so that an electric power is stopped to be supplied from said battery to said main circuit.