Which factor does not directly affect the end-of-charge voltage of a nickel-cadmium battery when it remains on charge?

• A. Temperature
• B. Charging method
• C. Cell count
• D. State of charge

Answer: (C)

End-of-charge voltage is determined by how a nickel-cadmium cell behaves during charging, which depends on the cell’s chemistry and how you monitor the charge. Temperature affects the cell’s voltage response and the reliability of detecting full charge. The charging method sets how the charger decides when to stop (for example, by a voltage threshold, a dV/dt signal, or temperature rise). The initial state of charge influences when that stopping point is reached during a cycle. The number of cells in a pack doesn’t change the voltage at which each cell reaches full charge; it only scales the total pack voltage. So while more cells raise the overall pack voltage, the end-of-charge threshold per cell remains essentially the same.