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A method of operating a downhole component (for example a battery pack) comprising at least one electrolyte based element. The method comprising the steps of locating the component in a downhole environment and whilst the component is in the downhole environment subjecting the element to a pressure

A method of operating a downhole component (for example a battery pack) comprising at least one electrolyte based element. The method comprising the steps of locating the component in a downhole environment and whilst the component is in the downhole environment subjecting the element to a pressure in excess of atmospheric pressure to suppress at least one of boiling and evaporation of electrolyte in the element. The component may then be operated at a temperature in excess of that which would be tolerated by the electrolyte based element if not subjected to a pressure in excess of atmospheric pressure.

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The invention claimed is: 1. A method of operating a battery comprising at least one electrolyte based cell, the method comprising the steps of disposing the battery together with one of an electronics module and an equipment module in a pressure containment vessel, locating the vessel containing t

The invention claimed is: 1. A method of operating a battery comprising at least one electrolyte based cell, the method comprising the steps of disposing the battery together with one of an electronics module and an equipment module in a pressure containment vessel, locating the vessel containing the battery and said one of an electronics module and an equipment module in a downhole environment and whilst the battery is in the downhole environment suppressing at least one of boiling and evaporation of electrolyte in the cell by subjecting the cell to a pressure in excess of atmospheric pressure, wherein the suppressing step comprises the step of pressurising the vessel to a predetermined pressure in excess of atmospheric pressure before locating the vessel in a downhole environment. 2. A method according to claim 1 comprising the further step of operating the battery at a temperature in excess of that which would be tolerated by the electrolyte based cell if not subjected to a pressure in excess of atmospheric pressure. 3. A method according to claim 1 wherein the electrolyte based cell has a specified maximum normal operating temperature for normal operating conditions and the method comprises the step of operating the electrolyte based cell at a temperature in excess of said maximum normal operating temperature. 4. A method according to claim 1 wherein the battery is located in a downhole environment having a temperature in the range of 100�� C. to 500�� C. 5. A method according to claim 1 in which the pressure to which the cell is subjected is in the order of 3 to 6 bar. 6. A method according to claim 1 in which the pressure containment vessel is filled with one of air, nitrogen and oil to provide the desired pressure. 7. A method according to claim 1 in which the pressure containment vessel comprises at least one bi-directional pressure seal to seal the interior of the vessel against the surroundings. 8. A method according to claim 1, further comprising providing the pressure containment vessel with at least one bi-directional pressure seal to seal the interior of the vessel against the surroundings. 9. A method according to claim 1, further comprising using a battery which has a casing which is independent of the pressure containment vessel. 10. A downhole component assembly comprising a pressure containment vessel within which is disposed a battery comprising at least one electrolyte based cell and one of an electronics module and an equipment module wherein the vessel is arranged to be pre-pressurised to a predetermined pressure in excess of atmospheric pressure, prior to location of the component assembly downhole, to suppress at least one of boiling and evaporation of electrolyte in the cell when the component assembly is located downhole whereby the component assembly is arranged to be subjected to temperatures in excess of a normal operating temperature of the battery. 11. A well installation comprising a downhole component assembly according to claim 10, wherein the vessel is pressurised to a pressure in excess of atmosphere pressure and the assembly is disposed at a location in the well installation where the temperature is in excess of that which would be tolerated by the electrolyte based cell if at atmosphere pressure. 12. A well installation according to claim 11, wherein the pressure containment vessel comprises at least one bi-directional pressure seal to seal the interior of the vessel against the surroundings. 13. A well installation according to claim 11, wherein the battery has a casing which is independent of the pressure containment vessel. 14. A component assembly according to claim 10, wherein the pressure containment vessel comprises at least one bi-directional pressure seal to seal the interior of the vessel against the surroundings. 15. A component assembly according to claim 10, wherein the battery has a casing which is independent of the pressure containment vessel. 16. A downhole component assembly usable at 100�� C. and above, comprising a pressure containment vessel within which is disposed a battery comprising at least one electrolyte based cell and one of an electronics module and an equipment module wherein the vessel is arranged to be pre-pressurised to a predetermined pressure in excess of atmospheric pressure, prior to location of the component assembly downhole, to suppress at least one of boiling and evaporation of electrolyte in the cell when the component assembly is located downhole whereby the component assembly is arranged to be subjected to temperatures in excess of 100�� C. 17. A well installation comprising a downhole component assembly according to claim 16, wherein the vessel is pressurised to a pressure in excess of atmosphere pressure and the assembly is disposed at a location in the well installation where the temperature is in excess of 100�� C.