Wearable enzymatic biofuel cells are often described by isolated quantities such as open-circuit voltage, maximum power density, or analyte sensitivity, although their practical performance is governed by the simultaneous coupling of load selection, enzyme affinity, transport state, sweat composition, and mechanical deformation. This paper develops a load-adaptive energy–transport normalization of a flexible printed glucose-oxidase biofuel cell in which naphthoquinone/multiwalled-carbon-nanotube and Prussian-blue/multiwalled-carbon-nanotube nanocomposites form the bioanode and biocathode, respectively. The analysis treats maximum-power operation, resistance-area matching, apparent Michaelis compatibility, scan-rate-derived transport behavior, artificial-sweat voltage calibration, interferent tolerance, and bending endurance as mutually dependent descriptors of one self-powered sensing material. At 20 mM glucose, the cell produces 266 μW cm−2 at 0.20 V, giving a maximum-power current density of 1.33 mA cm−2, an area-normalized external-load requirement of 150 Ω cm2, and an internal-loss term of 188 Ω cm2. Apparent Michaelis constants of 2.47 mM for the bioanode and 2.99 mM for the biocathode yield a kinetic-balance factor of 0.995, showing that the single-enzyme electrode pair remains closely matched over the same low-millimolar glucose window. The artificial-sweat voltage response follows a saturating calibration with \(R^{2}=0.9737\), while the printed film retains more than 83% of electrochemical response after 100 repeated 180 ° bending cycles. These results answer the central question by showing that the device is not merely a high-power flexible biofuel cell; it is a load-sensitive, transport-limited, mechanically recoverable nanocomposite transducer whose reliable biosensing operation requires calibration under the same load and deformation conditions intended for use.
