415 adapted to receive a tab 414 finally positioning guides 416 can also be selectively positioned to aid the manufacture of the battery the alignment mechanisms 41 6 are shown in detail in the cross sections of fig1 and 12 taken at lines b b of fig9 turning now to fig1 a cross sectional view taken at lines b b of fig9 shows the alignment of the inner casing 408 with outer casing 402 and the ultrasonic bonding at energy director 410 in particular positioning guide 416 provides a reference point for inner casing 408 additionally an embankment 418 can be included to prevent the movement of foot 412 of inner casing 408 during ultrasonic bonding that is because the energy director is positioned along an inclined portion of outer casing 402 foot 412 which is normally horizontal is forced into an inclined position during the ultrasonic bonding accordingly embankment 418 prevents the movement of foot 412 away from positioning guide 416 although foot 412 is shown positioned at a particular location along the outer casing 402 it will be understood that energy director 410 be positioned at any location along wall 410 turning to fig1 an alternate embodiment incorporates a leveling surface 420 including the energy director 410 leveling surface 420 prevents foot 412 from being forced to an inclined position during ultrasonic bonding in summary the present invention reduces the complexity for manufacturing and the weight of the completed battery in particular a combination of ultrasonic bonding and adhesive bonding can reduce the.