NOVELTY - The sintered electrolyte sheet has a body of no more than 45-micrometer thick, and at least one laser machined feature with at least one edge surface having at least 10-percent ablation. The edge surface has more than 50-percent fracture and less than 50-percent ablation. Several electrodes are situated on the electrolyte sheet. The electrolyte sheet is zirconia based, and includes micromachined edge. The relative concentration of zirconium at the micromachined edge is higher than at another area located at the surface of the electrolyte sheet further from the laser micromachined edge.    USE - Sintered electrolyte sheet used in fuel cell device (claimed).    ADVANTAGE - Utilizes laser micromachining of the sintered electrolyte sheets and fuel cell devices in order to cut the electrolyte sheets and fuel cell device components to size, to trim the edges of sintered electrolyte sheet edges or fuel cell devices, and to produce via holes and surface modifications or patterns. Allows fabrication of new fuel cell designs, and increases the fabrication yield and strength of the current fuel cell devices. Ensures that the speed, placement accuracy, and resulting quality of the electrolyte sheet edge or edges enable flexibility in device design, handling, and improved electrolyte sheet edge strength. Ensures that micromachining process can be utilized at any desired time after the electrolyte sintering, enabling flexibility in device fabrication. Provides devices and electrolyte sheets that have surprising improvements to flatness and strength. Ensures that laser machining of single and multi-cell devices may be performed after sealing or mounting of the fuel cell device or devices in a support or manifold structure, and results in improved electrolyte sheet edge strength, device flatness, edge quality, fewer and smaller wrinkles, minimized electrolyte sheet edge curl, and process yield and throughput. Ensures that the micromachining may also be performed to cut electrolyte sheets, where multiple fuel cell devices are patterned e.g. printed on a single electrolyte sheet and the electrolyte sheets are then optionally laser machined to produce multiple devices, thereby saving time and labor. Performs laser micromachining that enables micromachining of the electrolyte in the sintered state, instead of before firing, eliminating the need to accurately predict shrinkage during binder burn-out and sintering and eliminating the need for the shrinkage to be uniform across the entire electrolyte sheet.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for the following:    (1) Laser micromachining method of the electrolyte sheet; and    (2) Fuel cell device manufacture method.    DESCRIPTION OF DRAWING(S) - The drawing shows the front view of the via hole formed on the sintered electrolyte sheet.