An apparatus and method for receiving inputs from a user is provided. The GPS receiving system can be used for both planar and non-planar receiving arrays, including arrays that are conformally applied to the surface of a platform such as an aircraft. An isolation structure is formed in the trench, and a photodiode is formed in the substrate adjacent to a sidewall of the trench. First and second pistons may be spaced axially apart along the shaft and each may extend radially outward beyond the shaft. Additional capacity is added to the cell by utilizing a current collector comprising a consumable electrochemically active material having a lower potential than the electrochemically active material of the associated electrode, such as lithium, and a discharge voltage above a predetermined cut-off voltage.