An emergency inflation system for an inflatable device, the emergency inflation system comprising: an electrical device, an emergency power supply for said electrical device, said power supply comprising: a housing sealed to prohibit ingress of liquid; a capacitor disposed within the housing; a clamp member that couples the capacitor to the housing, the clamp member comprising a compression member configured to apply a clamping force on the capacitor to reduce movement of the capacitor relative to the housing; a multi-pin connector that extends through the housing and is sealed to prohibit ingress of liquid into the housing, wherein the connector is configured to provide an electrical interface between the capacitor and the electrical device, and between the capacitor and an external power source, such that the capacitor is charged by the external power source; and a control circuit disposed within the housing, said control circuit being configured to selectively release power stored in the capacitor to operate the electrical device responsive to power from the external power source ceasing, wherein the housing is sealed such that the power supply is operable when submerged in the liquid to provide power to the electrical device via the multi pin connector, the electrical device located outside the sealed housing. an electrical device, an emergency power supply for said electrical device, said power supply comprising: a housing sealed to prohibit ingress of liquid; a capacitor disposed within the housing; a clamp member that couples the capacitor to the housing, the clamp member comprising a compression member configured to apply a clamping force on the capacitor to reduce movement of the capacitor relative to the housing; a multi-pin connector that extends through the housing and is sealed to prohibit ingress of liquid into the housing, wherein the connector is configured to provide an electrical interface between the capacitor and the electrical device, and between the capacitor and an external power source, such that the capacitor is charged by the external power source; and a control circuit disposed within the housing, said control circuit being configured to selectively release power stored in the capacitor to operate the electrical device responsive to power from the external power source ceasing, wherein the housing is sealed such that the power supply is operable when submerged in the liquid to provide power to the electrical device via the multi pin connector, the electrical device located outside the sealed housing. a housing sealed to prohibit ingress of liquid; a capacitor disposed within the housing; a clamp member that couples the capacitor to the housing, the clamp member comprising a compression member configured to apply a clamping force on the capacitor to reduce movement of the capacitor relative to the housing; a multi-pin connector that extends through the housing and is sealed to prohibit ingress of liquid into the housing, wherein the connector is configured to provide an electrical interface between the capacitor and the electrical device, and between the capacitor and an external power source, such that the capacitor is charged by the external power source; and a control circuit disposed within the housing, said control circuit being configured to selectively release power stored in the capacitor to operate the electrical device responsive to power from the external power source ceasing, wherein the housing is sealed such that the power supply is operable when submerged in the liquid to provide power to the electrical device via the multi pin connector, the electrical device located outside the sealed housing.