<![CDATA[Batteries serve as a crucial backup direct current (DC) source in substations, especially during power outages (blackouts). The reliability and lifespan of these batteries are critical factors in ensuring the continuous operation of the system. This study analyzes the performance of 110 VDC NiCd (Nickel-Cadmium) alkaline batteries at the Jepara 150 kV Substation, which have been in operation for over 10 years. This research is relevant given that the replacement criteria for substation batteries typically range from 10-15 years. This study employs a comparative method using discharging data collected in 2018 and 2020. The results show that while the battery's efficiency remains stable at 99.41%—which is still considered good and above the standard (>80%)—several key parameters have degraded. The battery is still capable of supplying the load for 16.9 hours. However, its specific gravity value has decreased to 1.1305 kg/l, which is below the standard (1.17-1.19 kg/l). Furthermore, the total battery voltage in 2020 was measured at 85.8 V, a drop of 2.1 V from 2018. Further analysis found that this voltage drop was caused by the presence of "dropped" battery cells. In the 2018 discharge test, there were two cells with voltages below the minimum limit. This number increased to five cells in the 2020 test. If this condition is left unaddressed, it is predicted that the battery's voltage and efficiency will continue to decline in the coming years, which could impact the overall system reliability. Thus, although its efficiency remains good, the degradation of critical parameters such as specific gravity and cell voltage indicates that the battery's quality is beginning to decline.]]>
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