Battery Charge and Health Display

Flash pattern	Battery status	Battery state of charge	Remark
Steady light	Full charge	> 75 %
Steady light	Medium charge	55 - 74 %
Steady light	Low charge	21 - 54 %	Charge battery when possible
Flashing	Empty	< 21 %	Charge battery
Steady light for 1.5 second	Self-test when powering on		Battery operational after 1.5 second
Steady light	Battery cell temperature out of range: Too high temperature		Let battery cool before continuing operation
	Battery cell temperature out of range: Too low temperature		Make sure ambient temperature is within range. See Battery Temperatures.
	Too high discharge current to tool		Check the tool configuration. Remove battery from tool
	Too high charge current		Remove battery from charger and replace charger
	Invalid charger		Use appropriate charger. See Battery Charger Data.
	Too high voltage applied externally to battery connector
Steady light	Unrecoverable error		Replace battery

When attaching the battery to the charger, the charging procedure will start and go on for 20 seconds. The charging is then temporarily stopped as the battery performs a self-test. The self-test continues for 10 seconds and after this the battery resumes charging again.

State of Health (SOH) Indicators:

SOH indicates how much of the original design capacity that is left in the battery cells, that is, how much the battery has degraded since it was new.

SOH is not an indication of current battery charge.

When the button is pressed for 10 seconds the battery SOH is shown, as listed below:

Indication	Flash pattern	State of Health (SOH)
	1 flash, green	More than 80% of the original capacity
	1 flash, yellow	Between 70-80% of the original capacity
	1 flash, red	Less than 70% of original capacity

State of Health Signals

When the button is pressed for 20 seconds the battery state is shown by the LEDs flashing in sequence, as listed below.

If the button is pressed for more than one minute, the battery goes into boot mode. All three white indicators will flash one by one, in sequence.

LED Sequence	Battery State
Green, green, green	Sleep, normal state
Green, green, yellow	Idle, normal state
Green, green, red	Empty, normal state
Green, green, white	Charge over temperature, transient state
Green, yellow, green	Charge under temperature, transient state
Green, yellow, yellow	Discharge over temperature
Green, yellow, red	Discharge under temperature
Green, yellow, white	Charge over current
Green, red, green	Discharge over current
Green, red, yellow	MOSFET over temperature
Green, red, red	No parameters
Green, red, white	Calibration mode
Green, white, green	Fully charged state
Green, white, yellow	Discharging
Green, white, red	Charging
Yellow, green, green	Transport mode
Yellow, green, yellow	Powering down
Yellow, green, red	Cell temperature sensor broken
Yellow, green, white	MOSFET temperature sensor broken
Yellow, yellow, green	Cell voltage too low
Yellow, yellow, yellow	Cell voltage too high
Yellow, yellow, red	Cells are unbalanced
Yellow, yellow, white	Pack is over voltage
Yellow, red, green	Charge MOSFET is broken
Yellow, red, yellow	Discharge MOSFET is broken
Yellow, red, red	Initializing at startup
Yellow, red, white	Discharge off, test mode
Yellow, white, green	Charge off, test mode
Yellow, white, yellow	Discharge and charge off, test mode
Yellow, white, red	Disconnect from charger state
Yellow, white, white	Charger is invalid
Red, green, green	Charge software is wrong version
Red, green, yellow	Charge FET self-test
Red, green, red	Discharge FET self-test
Red, green, white	Sum of cell voltages not accurate
Red, yellow, green	Faulty cell connector
Red, yellow, yellow	Accumulator over voltage
Red, yellow, red	Mismatch between temperatures
Red, yellow, white	Pack over temperature
Red, red, green	Over charged
White, white, red	Pack is dead

Relevant Information

Ambient Temperature