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The "dead battery" screen is shown when the battery needs to be recharged.
Has nothing to do with if the battery is "dead".
The thing you are missing:
That light (and the battery management/charger chip) is partly under the control of the firmware.
The firmware is not operating or not operating properly.
So how can you trust the light?
What you describe is a common failure mode with the K3.
They die and stay dead for some reason that no one has ever found.
Return the device.
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