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First: The led is under firmware control of some of the GPIO pins on the SoC.
Second: Don't trust it when the firmware is known to not be working as intended.
Third: It is a tri-color (rgb) led.
Fourth: The battery management and charge controller is on an external chip, under firmware control.
Fifth: Don't trust it when the firmware is known to not be working as intended.
Sixth: Some of the firmware installed on the system does not include control of the external chip, even when working properly.
Translation:
You may have to remove the battery and re-charge it on a charger external to the Kindle. If this is a K4 with a glued in place battery, doing that will be a challenge.
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