What indication tells you the batteries are completely depleted?

• A. All LEDs off
• B. Battery icon shows empty
• C. Chimes twice
• D. 5 LED blinking once per second

Answer: (D)

When a device signals battery status, patterns that grab attention and are unambiguous are the clearest clues about a dead or exhausted power source. A blinking sequence where five LEDs flash once per second is specifically designed to convey “no usable power left” in a way that stands out even if other indicators are ambiguous or the display isn’t showing data. It’s a dedicated alert meant to be read as a single status: the battery is completely depleted and needs replacement or recharging.

In contrast, all LEDs off could simply mean the device is off or the display is inactive, which isn’t conclusive about battery level. A blank battery icon depends on the UI being available and visible, so it may not appear in every state or on every device. Chimes twice is an audible alert that could indicate various issues or notifications, not necessarily a direct battery status signal.

So the blinking five-LED pattern is the most reliable, explicit indication that the batteries are completely depleted.