CST Level 1 Land Surveyor Certification Practice

What effect does discharging NiCad batteries fully prevent?

1. Change in voltage

2. Variability of electrical current

3. Development of 'memory'

4. Physical damage

The correct answer is: Development of 'memory'

Discharging NiCad batteries fully helps prevent the development of "memory" effect, which is a phenomenon that can occur in rechargeable batteries where they "remember" the point of discharge. When NiCad batteries are repeatedly partially discharged and recharged, they can lose capacity over time, effectively reducing the voltage range they can utilize. This happens because the areas of the battery that are not fully cycled can become inactive, leading to a situation where the battery performs at a lower efficiency and capacity. By fully discharging the batteries, users can maintain a wider range of operational voltage and preserve the full capacity of the cells, preventing them from "remembering" the lower discharge point. This is particularly important for applications requiring consistent power output, ensuring efficient performance and longevity of the battery. While other effects, such as physical damage or change in voltage, may occur if the batteries are improperly handled or maintained, fully discharging is primarily aimed at mitigating the memory effect.