I have tested the A draw and it is not 121 but closer to 110A. The ESC can handle that current with adequate cooling (which it has and its mounted on the arms and have plenty of airflow during flight). The batteries also can easily handle that current also. Even with just two Bonka 22000mah packs, they have a continuous discharge of 550A and a burst discharge of 1100A. http://www.bonkapower.com/a/Multicopter/20150825/11.html