Abstract: The battery charger is provided with temperature detection sections 12 to contact and detect the temperature of AA batteries 2A and AAA batteries 2B loaded in a battery pocket 3, and a charging circuit to detect battery temperature and control battery 2 charging. The battery charger is provided with AA battery 2A holders 11, which are circular openings 13 in the case 1, and AAA battery 2B holders 11, which are flexible arches 14. An AAA battery 2B is inserted into a flexible arch 14 and retained in a fixed position in the battery pocket 3. An AA battery 2A is not inserted into a flexible arch 14, but rather moves the flexible arch 14 causing it to incline, and is inserted into a circular opening 13 for retention in a fixed position in the battery pocket 3. The battery charger charges batteries 2 set in fixed positions in the battery pocket 3 while detecting battery 2 temperature via the temperature detection sections 12.

Abstract: The battery charger has a case provided with a battery pocket in which batteries can be loaded and unloaded. The battery charger is provided with temperature sensors which detect the temperature of batteries in the battery pocket, and with a charging circuit which detects battery temperature via the temperature sensors and controls charging current. Further, the battery charger is provided with thermal conducting units which press against the surfaces of batteries loaded in the battery pocket, and with spring structures which resiliently press the thermal conducting units against the surfaces of the batteries. Thermal conducting units are provided with thermal conducting plates and temperature sensors.

Abstract: A battery discharging apparatus is provided with a battery discharger and a controller. The controller is connected to a battery voltage sensor and a timer, a current sensor and a discharge switch, or a current sensor and a battery power capacity sensor. The controller directs the discharger to recover battery capacity lost due to the memory effect using a deep memory effect eliminating discharge.

Abstract: A residual capacity displaying device which discriminates whether or not a battery is deteriorated, and display the result of the discrimination. The residual capacity displaying device for a battery pack includes a current detecting unit for detecting current flowing to and from a battery pack. A battery identifying unit identifies the kind of the battery pack, and an arithmetic unit calculates the capacity of the battery pack according to the output of the current detecting unit and the time thereof. The dischargeable capacity of the battery pack is stored according to the output of the battery identifying unit. Also, the capacity of the battery pack which is discharged is compared until the voltage of the battery pack reaches a predetermined voltage value with the dischargeable capacity. When the result of comparison reaches a predetermined value, LEDs display the fact that the battery pack has been deteriorated.

Abstract: A battery discharging apparatus is provided with a battery discharger and a control unit. The control unit is provided with a current sensor and a battery power capacity sensor. The control unit directs the discharger to recover battery capacity lost due to memory effect using a deep memory effect eliminating discharge.