XR Battery Status LEDs

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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 get it added. 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, rather than “you broke it.”

In most cases involving some sort of communication issue, ensuring that the battery connector is secure and cleaning the contacts can 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.)
	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.

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.)

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.

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.

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