Abstract: An electrical conduction assembly comprising a flexible layer, an interface being associated with and electrically coupled to a terminal of an external electrical element, and a circuit trace coupled to the flexible layer and to the interface. The circuit trace includes a fuse as part of the trace, and the fuse is associated with the interface. Also disclosed is a battery including the electrical conduction assembly. Further disclosed is a bus bar holder for a battery. The bus bar holder includes a lead-in structure coupled with a main body on a first side. The lead in structure includes a first lead-in wall to be disposed between a first plurality of battery cells and a second lead-in wall orthogonal to the first lead-in wall. The bus bar holder can also include a plurality of pockets, each or which includes a respective aperture and a respective recess.