The research aims were to construct an air-breathing paper-based microfluidic fuel cell (paper-based $\mu$ FC) and to evaluated it with different soft drinks to provide energy for their prospective use in portable devices as an emergency power source. First, in a half-cell configuration, cyclic voltammetry showed that glucose, maltose, and fructose had specific oxidation zones in the presence of platinum-ruthenium on carbon (PtRu/C) when they were individual. Still, when they were mixed, glucose was observed to be oxidized to a greater extent than fructose and maltose. After, when a paper-based $\mu$ FC was constructed, PtRu/C and platinum on carbon (Pt/C) were used as anode and cathode, the performance of this $\mu$ FC was mostly influenced by the concentration of glucose present in each soft drink, obtaining maximum power densities at room temperature of 0.061, 0.063, 0.060, and 0.073 mW cm ${}^{-2}$ for Coca Cola ${}^{\circledR }$ , Pepsi ${}^{\circledR }$ , Dr. Pepper ${}^{\circledR }$ , and 7up ${}^{\circledR }$ , respectively. Interestingly, when the soft drinks were cooled, the performance was increased up to 85%. Furthermore, a four-cell stack $\mu$ FC was constructed to demonstrate its usefulness as a possible power supply, obtaining a power density of 0.4 mW cm ${}^{-2}$ , using Coca Cola ${}^{\circledR }$ as fuel and air as oxidant. Together, the results of the present study indicate an alternative application of an $\mu$ FC using soft drinks as a backup source of energy in emergencies.