Which of the following statements concerning Nickel-Cadmium batteries is true?

Correct Answer: Option A — Nickel-Cadmium batteries can be stored for a long period of time while still keeping a full charge.

Nickel-Cadmium (Ni-Cd) batteries experience very low internal self-discharge rates, allowing them to remain idle for extended periods while retaining a near-full charge, unlike traditional lead-acid chemistries.