Abstract: A bushing (40A) for a lead-acid battery includes: a cylindrical bushing main body portion (41) that can be fitted to a pole (45); and a columnar terminal portion (50) located at a position offset from the bushing main body portion (41) in plan view, in which the terminal portion (50) includes: a pedestal portion (52) integrally coupled to the bushing main body portion (41) via a coupling portion; and a connecting portion (51) which is located on the pedestal portion (52) and to which an external terminal is connected, and in which the pedestal portion (52) has a recessed cavity portion (53) on a bottom surface of the pedestal portion (52).

Abstract: A liquid-fuel feed fuel cell disclosed with a unit cell that has a structure in which a negative electrode and a positive electrode are opposed with a polymer electrolyte having a proton conductivity interposed between them. A liquid fuel is supplied to the negative electrode and air is supplied to the positive electrode. The liquid-fuel feed fuel cell has a cell stack where unit cells are stacked. Additionally, an operation monitoring method for monitoring the operation and an operation monitoring device are disclosed. To prevent degradation, the liquid-fuel feed fuel cell has at least one of the following functions: increasing the supply of air or liquid fuel, issuing an alarm, decreasing the output current, and stopping the operation of the fuel cell when it is detected that the potential between the negative and positive electrodes monitored for at least one cell is below a predetermined negative potential.