A sodium metal chloride battery is one of the promising candidates in the battery energy storage system which has gained considerable attention due to the global interest about environment. An easy approach is shown, in this study, to obtain the low cost and high cell capacity in a Na-(Ni,Fe)Cl2 battery. It is the usage of Fe particles which are larger than Ni particles. Consequently, the Ni content is significantly decreased to be approximately 50 wt % in the Na-(Ni,Fe)Cl2 cell, and this cell shows an excellent cell capacity of 263 mAh g−1 (per the weight of Ni-Fe composites). In general, the Ni content is 86–100 wt % in a Na-(Ni,Fe)Cl2 [or Na-NiCl2] battery. Especially, in this manuscript, a simple test cell is also suggested for the study of active materials in a Na-MCl2 (M: metal) battery. Until now, it has been difficult to study a sodium metal chloride battery in a small-and-academic laboratory, since a lot of exclusive equipment is necessary to assemble the cell. It is expected that this simple test cell can assist the study of a sodium metal chloride battery in an academic laboratory.