Devices, systems and methods for generating electricity from gases stored in containers under pressure

A breathing system for a user, comprising:

• a container to store a gas under pressure, the gas comprising oxygen, the container comprising an outlet through which the gas exits the container;
• a generator system comprising a generator within a housing, the generator in operative connection with the container outlet such that energy is supplied to the generator by the pressurized gas and the generator converts the energy supplied by the pressurized gas to electrical energy without limiting the flow of pressurized gas to the user;
• the electrical energy being transmitted outside the housing to operate an external load;
• a fluid path in connection with the generator through which pressurized gas passes after providing energy to the generator;
• and
• a respiration facepiece in fluid connection with the fluid path.