Why does the elasticity of some battery clips decrease or disappear?

Only one of the grips of the battery clip is a link wire. When we use the battery clip, another grip that is not connected to the wire is connected and energized during use, and then the grip of the wire is not connected to the object, and the current will pass. The spring of the battery clip transmits power transmission. When the current load exceeds the spring, the spring will generate heat. When the spring passes through the high-temperature elastic force, the spring force will decrease or disappear, so the elastic force of the battery clip is lost.

It is especially obvious to replace the welding machine grounding clamp with the battery clip. Therefore, when using the battery clamp, we should try to let the half of the connecting wire transmit power and prevent the spring from being overheated so that the battery clip will not be reduced. Or disappear.