Battery charger

Battery pack (50) may include rechargeable batteries (55) and first temperature sensor TM1 for detecting the temperature of batteries (55). Battery charger (10) may include power source circuit (32) for supplying charging current to batteries (55) of battery pack (50). Battery charger (10) may also include second temperature sensor TM2 located in the vicinity of power source circuit (32). Battery charger (10) may further include a processor for controlling power source circuit (32). The processor may select charging current that will be supplied by power source circuit (32) to batteries (55) based at least upon battery temperature from first temperature sensor TM1 and power source circuit temperature from second temperature sensor TM2, and supply the selected charging current to batteries (55).