Battery charger capable of accurately detecting battery temperature for full charge determination

A battery charger for charging a battery pack having a battery, a temperature sensor for sensing a temperature of the battery, and a battery terminal, the battery charger comprising:

• a charger terminal to which the battery terminal is connected when the battery is charged;
• a charge current generating circuit that generates a charge current for charging the battery, the charge current having a level;
• a battery temperature detector that detects a temperature of the battery while cooperating with the temperature sensor and outputs a temperature signal indicative of the temperature of the battery;
• and
• a controller that is supplied with the temperature signal from the battery temperature detector, corrects the temperature signal, and provides a corrected temperature signal, the corrected temperature signal being substantially free from influence of contact resistance yielded in a contact portion of the battery terminal and the charger terminal.