Disclosed is an invention in the field of conducting an immunoassay of 25 vitamin D in blood or blood components, notably serum or plasma. Specifically, the developer of the application may install analytic software, which may be embodied as a software development kit, on an integrated development environment associated with the developer, wherein the analytic software may be installed with a wizard-like interface having a series of easy to follow instructions. At least two or more sub-battery modules are stacked and arranged in parallel, such that the surfaces on which the electrode tabs are formed are aligned in the same direction.