通过放出额定容量的30--40%，来掌握圣阳蓄电池组的大致容量，保障电源系统可靠运行。其方法是：

1、在直流供电系统中，调整整流器输出电压至其保护电压，由圣阳蓄电池对实际通信负荷供电。SACREDSUN电池组放电前后要测量记录每只电池的端电压、温度、室温和放电时间。直到放出额定容量的30--40%为止。

2、放电结束后，要对圣阳电池组进行充电。

3、根据测量记录的数据绘制放电曲线，留作以后再次测量时比较。

4、落后圣阳蓄电池在放电时端电压偏低，因此落后蓄电池应在放电状态下测量。出现落后电池时应对蓄电池组进行均充电。

By releasing 30-40% of the rated capacity, we can grasp the approximate capacity of shengyang battery to ensure the reliable operation of the power supply system.The method is:

1. In the dc power supply system, adjust the output voltage of the rectifier to its protection voltage, and the actual communication load will be supplied by shengyang battery.The end voltage, temperature, room temperature and discharge time of each battery should be measured and recorded before and after discharge of the SACREDSUN battery.Until 30- 40% of the rated capacity is released.

2. After the discharge, the sunyang battery should be charged.

3. Draw the discharge curve according to the data recorded in the measurement, and save it for comparison in future measurement.

4. The terminal voltage of backward shengyang battery is low when discharging, so the backward battery should be measured in the discharge state.In case of backward batteries, the battery should be charged.