A contact lens comprising: an insert device comprising: an electroactive element responsive to a controlling voltage signal; a biocompatible battery (110, 470) for use in, or proximate to, the body of a living organism, wherein the biocompatible battery comprises: a first and second current collector; a cathode; a separator; an anode; and a laminar structure, wherein at least one layer of the laminar structure has a volume removed to form a cavity, wherein the cavity contains an electrolyte solution, wherein the electrolyte solution comprises: an ionizing salt, wherein the ionizing salt is one or more of: zinc chloride, ammonium chloride, zinc acetate, zinc sulfate, zinc bromide, zinc gluconate hydrate, zinc nitrate, and zinc iodide; indium +3 ion supplied as indium acetate; and a solvent; wherein a circuit electrically connected to the biocompatible battery provides the controlling voltage signal. an insert device comprising: an electroactive element responsive to a controlling voltage signal; a biocompatible battery (110, 470) for use in, or proximate to, the body of a living organism, wherein the biocompatible battery comprises: a first and second current collector; a cathode; a separator; an anode; and a laminar structure, wherein at least one layer of the laminar structure has a volume removed to form a cavity, wherein the cavity contains an electrolyte solution, wherein the electrolyte solution comprises: an ionizing salt, wherein the ionizing salt is one or more of: zinc chloride, ammonium chloride, zinc acetate, zinc sulfate, zinc bromide, zinc gluconate hydrate, zinc nitrate, and zinc iodide; indium +3 ion supplied as indium acetate; and a solvent; wherein a circuit electrically connected to the biocompatible battery provides the controlling voltage signal. an electroactive element responsive to a controlling voltage signal; a biocompatible battery (110, 470) for use in, or proximate to, the body of a living organism, wherein the biocompatible battery comprises: a first and second current collector; a cathode; a separator; an anode; and a laminar structure, wherein at least one layer of the laminar structure has a volume removed to form a cavity, wherein the cavity contains an electrolyte solution, wherein the electrolyte solution comprises: an ionizing salt, wherein the ionizing salt is one or more of: zinc chloride, ammonium chloride, zinc acetate, zinc sulfate, zinc bromide, zinc gluconate hydrate, zinc nitrate, and zinc iodide; indium +3 ion supplied as indium acetate; and a solvent; a first and second current collector; a cathode; a separator; an anode; and a laminar structure, wherein at least one layer of the laminar structure has a volume removed to form a cavity, wherein the cavity contains an electrolyte solution, wherein the electrolyte solution comprises: an ionizing salt, wherein the ionizing salt is one or more of: zinc chloride, ammonium chloride, zinc acetate, zinc sulfate, zinc bromide, zinc gluconate hydrate, zinc nitrate, and zinc iodide; indium +3 ion supplied as indium acetate; and a solvent; an ionizing salt, wherein the ionizing salt is one or more of: zinc chloride, ammonium chloride, zinc acetate, zinc sulfate, zinc bromide, zinc gluconate hydrate, zinc nitrate, and zinc iodide; indium +3 ion supplied as indium acetate; and a solvent; wherein a circuit electrically connected to the biocompatible battery provides the controlling voltage signal.