The third generation of the Samsung Galaxy Note phablet series released September 25, 2013. Identifiable by the model number N9005.

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Fast blinking red light, but not battery/charging problem

My Galaxy Note 3 (SM-N900A with Android 5.0) has acquired a fast blinking red light (4 times/second) when the screen is dark. Everything else seems fine. The battery still holds a charge and charges as it always has. It happens whether the phone is plugged in for charging or not. I've rebooted, I've pulled the battery out and put it back in. I've gone to Settings -> Device -> LED indicator and unchecked all the boxes. Nothing affects it when the phone is turned on and the screen is off (due to timing out or me forcing it to "time out" by pressing the power button quickly).

I haven't found any documentation on what this might be other than due to battery problems, which I don't seem to be having. The phone is 3 years old and has spent almost all of its life plugged in for charging.

Any ideas what this means? Presumably it is a hardware notification, since it is unaffected by soft-disabling the LED indicator (on the one settings screen I mention above).

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Chosen Solution

Even though your battery seems to be working fine, I would try to get a new battery and see if it corrects the problem. If not then I would attempt to reset the phone factory or even trying to reset the settings only back to factory.

If none of this works, I would assume that you have something more serious going wrong. There is a chip on your phone that controls charging and everything about your battery. This chip could be bad causing it to think your battery is dead even though it isn't. I am not sure if the battery has anything on it that controls all of this as well.

You could also try resetting the phone to factory before buying a new battery.

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