Which indicator shows the batteries are completely depleted?

• A. All LEDs off
• B. Two LEDs blinking
• C. Five LEDs blinking once per second
• D. One LED blinking

Answer: (C)

Understanding how battery status indicators communicate depletion through LED patterns. When batteries are completely depleted, the indicator pattern is designed to stand out: all five LEDs blink together at a steady one-second cadence. This simultaneous, attention-grabbing blink signals a critical power state and tells you the device cannot operate until the battery is recharged or replaced. Other patterns convey different states: a few LEDs blinking or a single LED blinking indicate partial or warning conditions, while all LEDs off can simply mean the device is powered down or there is no power input, not necessarily that the battery is fully dead. Therefore, the five LEDs blinking once per second is the clearest, most unambiguous sign of complete depletion.