Battery

Robot Operation

• DO NOT plug/unplug battery while either power switch is in the on position.
• DO NOT attempt to power the robot with a discharged battery.
• DO NOT leave battery plugged into robot overnight or when not in use to prevent over accidental over discharge.

Charger Operation

LED Pattern	Meaning
Red/Green Flashing	BMS Connected; Battery Terminals Disconnected
Quick Red Flashing	Charge Cycle Beginning
Solid Red	Constant Current (SoC < 85%)
Red Flashing	Constant Voltage (SoC > 85%)
Solid Yellow	Equalize Stage
Solid Green	Charge Cycle Done/No Battery Connected

• When connecting or disconnecting the battery from the charger, ALWAYS connect/disconnect the data cable first then the power cable.
• DO NOT unplug the power cable if charger indicator is not green.
• DO NOT use any charger other than the one provided with Cassie.
• DO charge in an open and well ventilated area away from bystanders.

Battery Damage Guidelines

Battery damage includes, but is not limited to:

• Short circuit
• Drop, crush, shock, vibration, or piercing
• Temperature in excess of 60 C°
• Exposure to fire or submersion in water

If a battery begins venting or catches on fire, evacuate the area and call the fire department.

Battery fires can be extinguished using the same fire extinguisher as for a traditional combustible fire. DO NOT use a Class D extinguisher as these are meant to extinguish Lithium metal fires and will not be effective.

Best Practices

In order to prolong your battery life, please refer to the following tips.

• Depth of discharge is an important factor in the cycle life of your battery. Repeated deep cycles to 0% will negatively impact the lifetime of your pack, as will repeated shallow cycles to above 90%.
• Storing your batteries at or below room temperature will limit self discharge and increase cycle life.
• Your battery will lose ~4% charge per day from powering the battery management circuitry, so exercise caution storing batteries for extended periods. A fully discharged battery that is stored for more than a few days, or a fully charged battery stored for more than 4 weeks may be unrecoverable.
• Leaving the battery plugged into the charger will not keep the battery "topped off." To charge the battery, it must be unplugged and plugged back into the charger.