A charge controlling circuit is provided in which a temperature of a main body of a portable cellular phone or an ambient temperature thereof is detected by a temperature sensor and, when the temperature is higher than or equal to an lower limit in a proper temperature range required by the secondary battery and is lower than a specified reference value, a charging current having a first current value is fed to the secondary battery and, when the temperature is lower than or equal to an upper limit in a proper temperature range required by the secondary battery and is higher than or equal to the specified reference value, a charging current having a second current value being less than the first current value is fed to the secondary battery. When the temperature is a value outside of a proper temperature range required by the secondary battery, the charging to the secondary battery is stopped.