XR Battery Status LEDs

Posted: May 23, 2020, Updated: October 14, 2023

This is a work in progress and is incomplete. If you have seen an error code and know what caused or lead to it, please open an issue so I can add it. If you're able to get a video, that helps me get the timing correct.

This is a list of XR Battery LED Statuses that I’ve encountered, and my best effort at describing the actual causes of them.

In most cases involving a communication issue, you should ensure that the battery connector is secure, and try reconnecting all the Higo connectors. Cleaning the contacts can also help fix some issues.

Abnormal Conditions

LED Pattern	LED Description	Status Description
	Triple blinking Red Power LED 2nd from top charge LED on	Red Light of Death (RLOD) - Fatal Error This is a permanent* error, indicating a that the BMS (Battery Management System) has detected an error that it can not recover from. This is overwhelmingly caused by cells becoming unbalanced (more than 500mV between the highest and lowest charged cells), but can be caused by other major problems. See the RLOD FAQ for more information.
	Red/yellow alternating power LED 2nd from top charge LED on	Overheating - Possible Issue One of the battery’s temperature sensors is reading a value that’s too high. Let the battery pack rest, and it will likely clear itself. (Via @ourcore.)
	Red/yellow alternating power LED Middle three charge LEDs on	Power Problem / High Amp Draw / Short Circuit - Possible Issue Seen when more than ~0.18A is immediately pulled from the XR Battery when first turned on. Probably also triggered above a certain threshold once the XR<->ESC Communication has initialized.
	Breathing yellow power LED Middle three charge LEDs on	CAN Communication Timeout - Possible Issue The battery believes that it’s connected to the ESC, but it stopped receiving CAN heartbeats from the ESC. This can seemingly also happen if the Battery is “on” (charging) for an extended period of time.
	Breathing yellow power LED Top charge LED on	Charger Problem - Possible Issue Seen when the charger voltage is too low, or can provide too little current, for the XR BMS to be happy. Charging at less than ~10W seems to cause this, but is probably thrown for any charging issue.

Normal Conditions

LED Pattern	LED Description	Status Description
	Fast breathing blue power LED	Bluetooth Pairing In Progress Bluetooth pairing in progress, either to a phone or remote. Pressing the power button 5 times in a row initiates this mode.
	Solid yellow power LED	Battery Disconnected The battery believes that it’s not connected to anything. This is a normal status if you power on the battery when it’s not connected to a board.
	Solid green power LED	Powered On Everything is working normally!

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