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.