A system for use with a wearable defibrillator (100, 300, 400) worn by a patient, the system comprising: an electrode; a source of pressurized fluid; a conductive fluid reservoir (600, 700, 800, 900, 1008, 1012) containing a conductive fluid (602, 702, 802, 902, 1202, 1302), the conductive fluid reservoir (600, 700, 800, 900, 1008, 1012, 1200, 1300) comprising one or more outlets (606, 706, 806, 906) and an inflatable pouch (608, 708, 808, 908); a fluid channel (1006, 1010) fluidly connecting the source of pressurized fluid to the fluid reservoir (700, 800, 900, 1008, 1012, 1200, 1300); and a controller configured to control selective delivery of a pressurized fluid from the source of pressurized fluid to the inflatable pouch (608, 708, 808, 908), wherein the inflatable pouch (608, 708, 808, 908) is configured to be inflated from a deflated state to an inflated state in response to the pressurized fluid being delivered from the source of pressurized fluid; wherein, in the deflated state, a free end (614, 714, 814, 914) of the inflatable pouch (608, 708, 808, 908) covers the one or more outlets (608, 706, 806, 906) and seals the one or more outlets (606, 706, 806, 906) from the conductive fluid in the conductive fluid reservoir (600, 700, 800, 900, 1008, 1012, 1200, 1300), and wherein, in the inflated state, the free end (614, 714, 814, 914) of the inflatable pouch (608, 708, 808, 908) is removed from the one or more outlets (606, 706, 806, 906) such that the conductive fluid is allowed to flow from the conductive fluid reservoir (600, 700, 800, 900, 1008, 1012) through the one or more outlets (606, 706, 806, 906) to increase electrical connectivity between the electrode and the patient. an electrode; a source of pressurized fluid; a conductive fluid reservoir (600, 700, 800, 900, 1008, 1012) containing a conductive fluid (602, 702, 802, 902, 1202, 1302), the conductive fluid reservoir (600, 700, 800, 900, 1008, 1012, 1200, 1300) comprising one or more outlets (606, 706, 806, 906) and an inflatable pouch (608, 708, 808, 908); a fluid channel (1006, 1010) fluidly connecting the source of pressurized fluid to the fluid reservoir (700, 800, 900, 1008, 1012, 1200, 1300); and a controller configured to control selective delivery of a pressurized fluid from the source of pressurized fluid to the inflatable pouch (608, 708, 808, 908), wherein the inflatable pouch (608, 708, 808, 908) is configured to be inflated from a deflated state to an inflated state in response to the pressurized fluid being delivered from the source of pressurized fluid; wherein, in the deflated state, a free end (614, 714, 814, 914) of the inflatable pouch (608, 708, 808, 908) covers the one or more outlets (608, 706, 806, 906) and seals the one or more outlets (606, 706, 806, 906) from the conductive fluid in the conductive fluid reservoir (600, 700, 800, 900, 1008, 1012, 1200, 1300), and wherein, in the inflated state, the free end (614, 714, 814, 914) of the inflatable pouch (608, 708, 808, 908) is removed from the one or more outlets (606, 706, 806, 906) such that the conductive fluid is allowed to flow from the conductive fluid reservoir (600, 700, 800, 900, 1008, 1012) through the one or more outlets (606, 706, 806, 906) to increase electrical connectivity between the electrode and the patient.