In order to obtain a fundamental understanding of side-reactions in Na-ion batteries under commercially relevant conditions, full PW|HC cells were cycled in 1 M NaPF6 EC/DEC, 1:1 molar ratio (NP40) within the aforementioned stable voltage window (1.3 V-3.6 V). A relatively slow C-rate of 0.1C was chosen in order to be able to distinguish between individual gas evolution processes. Figure shows the voltage profile along with the gas evolution rate, n, data for H2, CO2, C2H4, and (CN)2.