The present invention provides an electrochemical cell of either a primary or a secondary chemistry housed in a casing having opposed major side walls of a contoured shape.

The present invention provides an implantable medical device contained in a housing having opposed major side walls of a contoured shape.

The invention includes a method of using a cell, such as a battery. In a method according to the invention, the cell is charged, discharged, and a voltage of the cell is measured after the discharge period. The measured voltage is compared to a standard vo...