Which indicator shows the batteries are almost depleted?

• A. Top LED blinking
• B. Bottom LED blinking once per second
• C. All LEDs blinking
• D. No LED indicators

Answer: (B)

When a device uses a multi-LED battery indicator, each LED corresponds to a level of remaining charge, and blinking patterns are used to grab your attention as power gets low. The bottom LED blinking once per second signals that the lowest charge level is reached and the device is urging you to recharge soon. This pattern is designed to be noticeable but not as alarming as a full fault condition, and it specifically communicates that the battery is almost depleted rather than completely dead or in another state.

If the battery were truly exhausted, you’d typically see no LEDs at all or the device would power off. A pattern where all LEDs blink is usually an alarm or fault indicator, and a top LED blinking doesn’t align with the “almost depleted” warning in standard indicators.