Before assembly of the device, the electrodes were soaked to ensure good wetting and infiltration of the electrolyte into the activated carbon micropores. Either both electrodes (cells A1 and A2) or only the bottom electrode (cells B1 and B2) were soaked for 2 hours. In the case of the cells with only one soaked electrode, the soaked electrode was used in the bottom, non-gas exposed, side. For cells B1 and B2 the separator was soaked alongside the bottom electrode. For cells A1 and A2, the separator was only briefly soaked in electrolyte (for a few seconds) before assembly. Qualitatively similar results were obtained with both symmetric and asymmetric soaking (see figures and tables below).