To provide a supply system of electric energy including a housing having a casing and a cap.

Connecting conductors 57A, 57B, 57C are connected to a cap 39, and plunger conductor assemblies 42A, 42B, 42C are electrically connected with the connecting conductors. Batteries 22 are placed in a casing 13 and electrically connected with a conductive concentric annular band 36. The plunger conductors are electrically connected with the concentric annular band as the cap is fitted to the casing, and accordingly, a conductive passage is formed from the batteries to the connecting conductors. Further, an electricity feeding system using such a housing is disclosed.