Mobile terminal, method of protecting battery, and battery protection program

1. A mobile terminal apparatus comprising:

a battery;

a temperature detection section configured to detect a temperature of the battery;

a voltage detection section configured to detect a battery voltage of the battery;

a discharge section configured to discharge the battery;

an illuminance detection section configured to detect an illuminance on the mobile terminal apparatus; and

a control section configured to connect the discharge section to one of three different terminals based on the temperature detected from the temperature detection section and the battery voltage detected from the voltage detection section, wherein (i) when the battery temperature is not less than a predetermined value and the battery voltage is greater not less than a first predetermined voltage and less than a second predetermined voltage that is greater than the first predetermined voltage, the control section connects the discharge section to a first one of the three different terminals to gradually discharge the battery in accordance with the detected illuminance, (ii) when the battery temperature is not less than the predetermined value and the battery voltage is not less than the second predetermined voltage, the control section connects the discharge section to a second one of the three different terminals to rapidly discharge the battery, and (iii) when the battery temperature is less than the predetermined value and the battery voltage is less than the first predetermined voltage, the control section connects the discharge section to a third one of the three different terminals to turn off the discharge section.

2. The mobile terminal apparatus according to claim 1 , further comprising a solar cell supplying charging power to the battery.

3. The mobile terminal apparatus according to claim 1 , further comprising:

a communication section for connecting to a mobile telephone network.

4. A method of protecting a battery, implemented on a mobile terminal apparatus having the battery, comprising:

detecting, at a temperature detection section, a temperature of the battery;

detecting, at a voltage detection section, a battery voltage of the battery;

discharging, at a discharge section, the battery;

detecting, at an illuminance detection section an illuminance on the mobile terminal apparatus; and

connecting, at a control section, the discharge section to one of three different terminals based on the temperature detected from the temperature detection section and the battery voltage detected from the voltage detection section,

wherein (i) when the battery temperature is not less than a predetermined value and the battery voltage is greater not less than a first predetermined voltage and less than a second predetermined voltage that is greater than the first predetermined voltage, the control section connects the discharge section to a first one of the three different terminals to gradually discharge the battery in accordance with the detected illuminance, (ii) when the battery temperature is not less than the predetermined value and the battery voltage is not less than the second predetermined voltage, the control section connects the discharge section to a second one of the three different terminals to rapidly discharge the battery, and (iii) when the battery temperature is less than the predetermined value and the battery voltage is less than the first predetermined voltage, the control section connects the discharge section to a third one of the three different terminals to turn off the discharge section.

5. A computer readable storage medium encoded with computer executable instructions, which when executed by a mobile terminal apparatus having a battery, cause the mobile terminal apparatus to perform a method of protecting the battery, comprising:

detecting, at a temperature detection section, a temperature of the battery;

detecting, at a voltage detection section, a battery voltage of the battery;

discharging, at a discharge section, the battery;

detecting, at an illuminance detection section an illuminance on the mobile terminal apparatus; and

connecting, at a control section, the discharge section to one of three different terminals based on the temperature detected from the temperature detection section and the battery voltage detected from the voltage detection section, wherein (i) when the battery temperature is not less than a predetermined value and the battery voltage is greater not less than a first predetermined voltage and less than a second predetermined voltage that is greater than the first predetermined voltage, the control section connects the discharge section to a first one of the three different terminals to gradually discharge the battery in accordance with the detected illuminance, (ii) when the battery temperature is not less than the predetermined value and the battery voltage is not less than the second predetermined voltage, the control section connects the discharge section to a second one of the three different terminals to rapidly discharge the battery, and (iii) when the battery temperature is less than the predetermined value and the battery voltage is less than the first predetermined voltage, the control section connects the discharge section to a third one of the three different terminals to turn off the discharge section.

6. A mobile terminal apparatus comprising:

a battery;

a temperature detection means for detecting a temperature of the battery;

voltage detection means for detecting a battery voltage of the battery;

a discharge means for discharging the battery;

an illuminance detection means for detecting an illuminance on the mobile terminal apparatus; and

a control means for connecting the discharge means to one of three different terminals based on the temperature detected from the temperature detection means and the battery voltage detected from the voltage detection means, wherein (i) when the battery temperature is not less than a predetermined value and the battery voltage is greater not less than a first predetermined voltage and less than a second predetermined voltage that is greater than the first predetermined voltage, the control means connects the discharge means to a first one of the three different terminals to gradually discharge the battery in accordance with the detected illuminance, (ii) when the battery temperature is not less than the predetermined value and the battery voltage is not less than the second predetermined voltage, the control means connects the discharge section to a second one of the three different terminals to rapidly discharge the battery, and (iii) when the battery temperature is less than the predetermined value and the battery voltage is less than the first predetermined voltage, the control section connects the discharge means to a third one of the three different terminals to turn off the discharge means.