Within 15%. According to relevant information, the lug welding uses Longhe’s special ultrasonic welding head, which can better match the flat tooth welding process. Compared with the industry’s positive electrode welding, which has a fault rate of 30% to 40%, it has a patented ultrasonic lug laser welding process. It can ensure that the welding fault is controlled within 15%, which is significantly ahead of the industry level.