2A-50C Size : AA Ni-Cd Specification d Type: Rechargeable nickel cadmium battery Dimension D............................................................. 14 0.2mm d........................................................... 8.0 0.2mm H.......................................................... 48.0 0.5mm H Nominal Voltage................................................. 1.2V D (with jacket) Weight............................................................... ~22g Internal resistance At 1000Hz..................................................... ~32m Volts 1.8 1C 0.5C 1.6 Capacity Rated capacity...............................................500mAh 1) At 0.2C discharge...100%~105% of rated capacity. 2) At 0.5C discharge........95~100% of rated capacity. 3) At 1C discharge.............90~95% of rated capacity. 1.4 1.2 1 0.8 0.6 0.4 0.2 0 0 20 40 60 80 Capacity % 100 120 140 0.5C / 1C Rate Charging Curves 1) Slow charge 25mA x 15hrs. (0-45 C) To avoid overcharge, a timer is used to terminate the charging after 150% capacity input. 2) Normal charge 250mA x 3hrs. (10-40 C) To avoid overcharge, a timer is used to terminate the charging after 150% capacity input. In addition, a temperature cut off (TCO) device, i.e. thermostat, with cut off temperature at 55 C must be used for safety purpose. Volts 1.6 1.4 0.5C 1.2 1C 1 0.8 0.6 0.4 0.2 0 0 3) Quick charge 500300mA x 1.2hrs. (10-40 C) With charging current over 0.5C A, a joint use of dT or - V cut off is required. For dT control, a maximum allowable temperature rise is 1 C/min. Or if - V control is used, the maximum allowable voltage decrease is 10 mV/cell. TCO device with cut off temperature at 60 C should be used at the same time. 20 40 60 80 100 Capacity % 0.5C / 1C Rate Discharging Curve Volts 1.6 1.4 1.2 1 0.2C 0.8 0.6 Storage: 1) Storage Temperature........................-10 C to 45 C 0.4 0.2 0 0 5 10 15 Capacity % Remark: Weight and internal impedence are for reference only. 2C Rate Discharging Curves 20 25 120