The Create® 3 power adapter also supplies the Raspberry Pi 4 with power and communication through a USB 2.0 (Type C) on both the TurtleBot 4 and TurtleBot 4 Lite. The USB interface can supply up to 3A at 5V.
For more details, visit the Create® 3 Documentation.
It is recommended to not drain the robot below 20% as VBAT voltage begin to decline sharply at this level.