Abstract: Fuel cells and methods of operating fuel cells are disclosed. In one aspect, the invention features a fuel source for a fuel cell including a housing having an outlet, a structure having a portion in the housing, the structure defining a cavity and having a surface defining an opening in fluid communication with the cavity, and a fuel in the housing. The fuel is in fluid communication with the outlet through the opening and the cavity of the structure.

Abstract: Fuel cells and methods of operating fuel cells are disclosed. In one aspect, the invention features a fuel source for a fuel cell including a housing having an outlet, a structure having a portion in the housing, the structure defining a cavity and having a surface defining an opening in fluid communication with the cavity, and a fuel in the housing. The fuel is in fluid communication with the outlet through the opening and the cavity of the structure.

Abstract: A primary battery having at least one flat side running along its length. The battery can be used, for example, in a digital camera. The battery can have an anode comprising lithium and low resistance contacts. The anode and cathode can be in the form of sheets which are spirally wound with separator therebetween. The negative and positive contacts are uniquely positioned to prevent recharging the battery in the event that the battery is inserted into a conventional recharger designed for same size rechargeable batteries.