Abstract: An electrochemical device having a roll with elongated electrodes each supported in one of two alternating folds of a separator layer, and spirally wound in the roll with the separator layer to define two opposing ends, each of such ends only exposing a different one of the electrodes wound along the roll. The device having a disc shaped housing having upper and lower portions fixable to each other to set the device height. The upper portion provides a first member with a first surface disposed along one end of the roll. A second member with a second surface is disposed along the other end of the roll. Spring elements compressed between the second member and a third member, provided by the housing lower portion, apply pressure to force the second member toward the first member promoting contact of the first and second surfaces with different ones of the exposed electrodes.

Abstract: A system for delivering page messages to paging units over a wide area is provided through multiple transmission systems. The system has a controller for routing page messages to each paging unit through the transmission system to which the paging unit is registered. Each transmission system periodically sends a system message having at least a unique identifier for the transmission system. Each paging unit receives system messages of at least one of the transmission systems when located in the transmission system's coverage area, and receives page messages from the transmission system registered to the paging unit when located in that transmission system's coverage area. Paging units update their registration with the controller in accordance with the identifier of received system messages different from their current registered identifier via user enabled or automatic means. The controller may resend messages to paging units which were sent during periods of unlikely reception.