Using your Emax BabyHawk II is easy. First, make sure your battery is properly connected. The input voltage for the flight controller is 2 - 4S LiPo, and for the motor, it's 4S LiPo. Check that all the parts are securely in place before you take off. When flying, start in an open area to get used to the quad's responsiveness.
Here are some important notes. Don't exceed the maximum continuous current of 25A to avoid damaging the flight controller. Be careful when handling the motor's shaft as it's only 1.5mm in diameter.
For maintenance, regularly check the propellers for any signs of wear or damage. Clean the camera lens to ensure clear video. If you're not using the quad for a long time, store it in a dry place. Also, keep the battery charged at an appropriate level when not in use to prolong its life.