Technique for adjusting charging operation or discharging operation of external device by battery pack

A battery pack comprising:

• a rechargeable battery including (i) a positive electrode, (ii) a negative electrode, and (iii) at least one battery cell;
• a first power supply terminal configured to be detachably coupled to a positive electrode terminal of an external device;
• a second power supply terminal configured to be detachably coupled to a negative electrode terminal of the external device;
• a first signal terminal configured to be detachably coupled to a first corresponding terminal of the external device;
• a second signal terminal configured to be detachably coupled to a second corresponding terminal of the external device;
• a positive-side current path (i) electrically coupling the first power supply terminal to the positive electrode of the rechargeable battery or (ii) configured to electrically couple the first power supply terminal to the positive electrode of the rechargeable battery;
• a negative-side current path (i) electrically coupling the second power supply terminal to the negative electrode of the rechargeable battery or (ii) configured to electrically couple the second power supply terminal to the negative electrode of the rechargeable battery;
• a temperature signal generation circuit (i) including a temperature detection device and (ii) configured to generate a temperature signal across the first signal terminal and the second signal terminal, the temperature detection device having a variable resistance that is dependent on a battery temperature, the temperature signal having a voltage associated with the variable resistance, and the battery temperature corresponding to a temperature of (i) the rechargeable battery or (ii) the at least one battery cell;
• a biasing circuit configured to vary a physical electrical resistance of the biasing circuit to thereby bias the voltage of the temperature signal, wherein the voltage biased makes the external device reduce or stop (i) charging from the external device to the rechargeable battery and/or (ii) discharging from the rechargeable battery to the external device;
• and
• a control circuit configured to operate the biasing circuit based on a battery status, the battery status corresponding to (i) a status of the rechargeable battery and/or (ii) a status of the at least one battery cell.