Abstract: A battery pack which provides for the making of internal connections within the battery pack includes a plurality of apertures (206) having battery pack contacts (204) in register with the apertures (206) and are located on top of corresponding metal tabs (104). The invention allows for a welding tip to be passed through the aperture (206) in order to weld the battery pack contacts (204) to their corresponding metal tabs (104). Once welded the apertures (206) can be sealed by preferably placing a battery label over the apertures (206).

Abstract: Described is a flexible circuit for a battery cell where the tabs of the flexible circuit have two or more perpendicular axis of bending. The multiple axes of bending allow the flexible circuit to be placed atop a battery cell, and both tabs of the flexible circuit can then be pinch (series) welded to the tabs of the battery cell. This results in a strong, predictable weld, and a more durable, reliable, electronic product.

Abstract: A one-piece housing for a rectangular battery cell with circuitry disposed on its side is described. The top side of the housing is a protective ledge, covering only the circuitry disposed on the side of the battery cell, where the ledge lies in or below the imaginary plane formed by the top surface of the cell. The housing protects the battery circuitry, is easier to manufacture than a two-part housing, is lighter than a two-part housing, and has a lower profile.

Abstract: Described is a system for indicating the state of charge of a battery comprising a safety cover with an opening and a battery which can be placed in the safety cover in two orientations. One marking on the battery indicates the battery has been charged and the other marking indicates the battery has been discharged. Only one of the markings shows through the opening when the safety cover is placed on the battery in one orientation, and only the other marking shows through the marking when the safety cover is placed on the battery in the other orientation. The mnemonic system is easy to manufacture and easy to use.