Portable secondary battery

A housing for a secondary battery comprising:

• a flexible housing including an upper half and a lower half wherein one half includes a tongue and the other half includes a groove extending around a periphery of the housing, wherein the tongue and groove include at least one window provided along a joining line;
• a rigid insert including a tongue on one half of a periphery of the insert and a groove on the other half of the periphery of the insert, wherein the insert is configured to mount in the window, wherein the tongue on the insert mounts in the groove of housing and the groove of the insert is configured to be co-extensive with the housing groove and adapted to receive the tongue on the housing;
• and
• at least one externally accessible connector positioned in the housing, the connector being mounted to a printed circuit board including a distal connection end, wherein a back end of the connector, the printed circuit board and a portion of the distal connection end of the printed circuit board are disposed in a case, and further wherein the case is encapsulated in an overmolded body to create a weatherproof sealed environment.