Cap for a Fuel Cell/Candle

A cap for a fuel cell having a rim of predetermined peripheral shape, the cap comprising:

• a. a flanged edge region adapted to be sealingly fit over the edge of fuel cell, the flanged edge region having a bottom edge;
• b. a dome-shaped first region that is integral with and positioned inward from the flanged edge region, the dome shaped first region having a bottom edge that extends in a common plane with the flanged edge region;
• c. a first stack region of predetermined cross-sectional shape extending upwardly from the dome-shaped first region, the first stack region having a first cross-sectional area;
• d. a second stack region of predetermined cross-section extending upwardly from the first stack region, the second stack region having a second cross-sectional area smaller than the first cross-sectional area;
• and
• e. a tapering region integral with and extending upwardly from the second stack region, the tapering region having a lower edge that is of the second cross-sectional area and an upper edge that is of a third area smaller than the second cross-sectional area.