A module (11) includes a charging circuit (10) and a driving unit (14). The charging circuit (10) includes a power generation element (12) and an electric storage element (13). The power generation element (12) is connected to the electric storage element (13) to charge the electric storage element (13). The electric storage element (13) is connected to the driving unit (14) to drive the driving unit (14) with electric power stored. The power-generating voltage of the power generation element (12) has a value equal to or more than the charging voltage of the electric storage element (13). The electric storage element (13) is a secondary battery including a lithium-transition metal oxide in a positive electrode active material layer, and a lithium-titanium oxide of spinel-type crystal structure in a negative electrode active material layer.
