Quick Start =========== Startup Procedure ----------------- Step 1: Pre-start Checks ~~~~~~~~~~~~~~~~~~~~~~~~~ Before powering on, place the **A2** on a flat, stable surface with adequate clearance on all sides. Ensure the surrounding area is free of people and obstacles, and that the legs are arranged in a natural, untangled posture. .. warning:: Keep all personnel clear of the robot during startup. The A2 is a high-power machine and may make sudden movements as it transitions between control states. Step 2: Install the Batteries ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Insert both battery packs into their compartments until each latch engages with a clear *click*. Confirm both packs are fully seated and secured. **Do not force** a pack — if it does not seat smoothly, remove it and check the orientation. Step 3: Power On ~~~~~~~~~~~~~~~~ Power on each battery using the standard Unitree sequence: 1. Briefly press the battery power button once. 2. Press and hold the button for **more than 2 seconds** to turn the battery on. Wait approximately **one minute** for the robot to complete initialization and enter its idle/damping state. Step 4: Stand and Operate ~~~~~~~~~~~~~~~~~~~~~~~~~~~ Once initialization completes, use the remote controller to bring the A2 to a standing posture, then switch into locomotion (walking) mode. Verify the robot is balancing stably before issuing movement commands or releasing any support. .. note:: Exact controller key combinations depend on the firmware build shipped with your unit. Refer to the controller reference supplied with the robot and the official `Unitree A2 documentation `_ for the current key map. Emergency Stop -------------- If the A2 enters an abnormal or unsafe state, trigger the **emergency stop** — either via the physical E-stop button or the controller stop combination. The robot will enter a damping/protective mode and lower itself toward the ground in a controlled manner. .. important:: Always know the location of the emergency stop before operating the robot. Keep the external E-stop accessible throughout any field deployment. Shutdown Procedure ================== 1. Move the A2 to an open, level area with clearance behind it. 2. Command the robot into its resting/crouched posture using the controller. 3. Engage damping mode so the joints relax safely. 4. Briefly press each battery power button, then press and hold for **more than 2 seconds** to power down. After shutdown, if the robot will be unused for an extended period, remove both battery packs for safe storage. .. attention:: Keep hands and clothing clear of the leg joints during all posture transitions to avoid pinch injuries.