Anker Astro E4 Manual Del Usuario página 7

Astro E4 Power Meter Instructions
Press the power meter button once to trigger the LED power meter and
display the remaining power level.
Each of the LEDs represent 25% of the battery's capacity.
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The LED power meter will turn off when the device is fully charged.
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The LED power meter will stay on when charging a device, displaying the
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battery's remaining power, and will turn off when the device is fully charged
and not drawing a current.
The LED power meter will not activate when the battery is empty.
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