B1 User Manual
© 2022 All rights reserved, Unitree Robotics 19
Charging battery indicator: The battery pack LED light shows the current battery while charging.
Charging Indicator Light
LED1 LED2 LED3 LED4 Current Battery
0%-25%
25%-50%
50%-75%
75%-100%
Charging protection indication: The battery pack LED light can display battery protection information triggered
by abnormal charging.
Charging Protection Iindicator Light
LED1 LED2 LED3 LED4 Indication
LED2 2 times/sec Excessive Electric Current Charging
LED2 3 times/sec Short Circuit Charging
LED3 2 times/sec Excessively high battery voltage caused by overcharging
LED3 3 times/sec Excessively High Charging Voltage
LED4 2 times/sec Excessively Low Charging Temperature
LED4 3 times/sec Excessively High Charging Temperature
In the event of a fault (excessive charging electric current, short-circuiting of charging, excessively high battery
voltage caused by overcharging, and excessively high charging voltage), the users need to unplug the charger first to
eliminate the fault before plugging the charger again to resume charging. For example, if the charging temperature is
abnormal, unplug the charger first, and after the charging temperature returns to normal, plug the charger again to recharge.
reasons, the battery needs to be discharged during transportation. The discharge method is divided into active discharge
and passive discharge.
1) Active discharge: Install the battery pack into the robot and run to a lower battery (for exam around 65%).
2) Passive discharge: Battery storage self-discharge protection, please refer to "Battery Pack Function" for detailed
description.
Precautions for Use
1) The battery pack should be used at an ambient temperature of -5°C to 55°C. If the temperature is too high (above
60°C), the battery pack may catch fire or even explode. If the temperature is too low (below -10°C), the life span of the
battery pack will be seriously compromised.
2) It is forbidden to use the battery pack in a strong magnetic field or static electricity environment. Otherwise, the
battery pack protection board will fail, which will lead to the malfunction of the battery pack and the robot.
3) Stop using the robot as soon as possible and replace the battery pack with a new one or charge the battery pack
when only one bar of battery flashes.
4) Before installing or removing the battery pack in the B1 battery compartment, please make sure that the battery
pack is closed, otherwise the battery pack or the robot will be damaged.
Charging or storage of battery packs may result in fire or property damage and personal injury by improperly use.
For more detailed descriptions, please refer to the "Battery Pack Safe Operation Guide".
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