Since the update installed on November 3 2017 when the charge reaches 100% the red LED does not turn green to indicate charging has completed. Disconnecting charger turns it off. It flashes blue for notifications. I am guessing this is related to whatever was changed to get Fast Charging to work correctly again.
JeffRinDC, it's certainly strange to hear that you are experiencing issues with the LED properly showing whether the device is charged or not. When you charge your device to 100%, do you have any notifications that might cause the red LED to display?
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