NOVELTY - Insulated electronic device includes a heat generating fuel cell (2) partially covered with a layer of a fiber-reinforced aerogel composite (1). Two opposite sides of the fuel cell are open for electrical connections. The aerogel composite is encapsulated, coated or both of a polymeric or a metallic material.    USE - For insulating a fuel cell e.g alkaline fuel cell, polymer electrolyte membrane fuel cell, direct methanol fuel cell, solid oxide fuel cell, phosphoric acid fuel cell, molten carbonate fuel cell, regenerative fuel cell, zinc air fuel cell, and protonic ceramic fuel cell. Also, an insulated fuel cell for an electronic device e.g. a laptop computer, PDA, mobile phone, tag scanner, audio device, video device, display panel, video camera, digital camera, desktop computers, military portable computers, military phones, laser range finders, digital communication device, intelligence gathering sensor, electronically integrated apparel, night vision equipment, power tool, calculator, radio, remote controlled appliance, GPS device, handheld and portable television, car starters, flashlights, acoustic devices, portable heating device, portable vacuum cleaner or a portable medical tool (all claimed).    ADVANTAGE - Insulation of fuel cells with aerogel composites allows the fuel cells to be kept at higher operating temperatures which can yield higher power outputs. The heat-sensitive components of a device employing a fuel cell are protected by the aerogel composite. Aerogel composites are very lightweight and do not increase the weight of the system. Its heat flow resistance is exceptionally high so only a thin material is required to insulate the fuel cell.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for    (a) method of insulating an electronic device;    (b) method of insulating a fuel cell    DESCRIPTION OF DRAWING(S) - The figure shows an aerogel composite wrapped around four sides of the fuel cell.    Aerogel composite (1)    Fuel cell (2)