Curve, Charging

In secondary battery manipulation, a curve indicating the increase of voltage as the charging is prolonged. The rise in voltage with the duration of the charging current is not uniform. In one case, shown in the cut, there was a brief rapid rise of about 0.1 volt; then a long slow rise for 0.15 volt; then a more rapid rise for nearly 0.40 volt, and then the curve became a horizontal line indicating a ce ation of increase of voltage. The charging rate should be constant. The horizontal line is laid off in hours, the vertical in volts, so that the time is represented by absci as and the voltage by ordinates of the curve. IMG:8956969607833025625_170F121.jpg: Fig. 121. CHARGING CURVE OF A SECONDARY BATTERY.