A battery pack for a cordless power tool (10, 20, 30), comprising: a top housing supporting an electronic module and a battery terminal block connected to the electronics module, a bottom housing containing a plurality of battery cells; and a plurality of sense wires electrically connected between a corresponding cell and the electronics module; characterized in that: the plurality of battery cells is constrained between a pair of end caps, wherein each end cap includes a plurality of said sense wires extending across an outer surface thereof; and each end cap includes an integrated connector receiving a first end of each sense wire for connection to a corresponding connector of a wiring harness that is attached to the electronics module so as to connect the sense wires to the module; each end cap includes a plurality of spaced access holes there through, and pre-formed recesses which serve to retain fitted cell straps and which cover the access holes on interior surfaces on the end caps, the cell straps connecting the battery cells to power terminals, the cell straps (410, 710) and power terminal leads being welded to the cells through corresponding access holes; and each sense wire has a second spring end which extends through a corresponding access hole to be seated at a junction of a cell strap and battery cell exposed through the access hole so as to provide sensed data from the cell to the electronics module via the integrated connector. a top housing supporting an electronic module and a battery terminal block connected to the electronics module, a bottom housing containing a plurality of battery cells; and a plurality of sense wires electrically connected between a corresponding cell and the electronics module; characterized in that: the plurality of battery cells is constrained between a pair of end caps, wherein each end cap includes a plurality of said sense wires extending across an outer surface thereof; and each end cap includes an integrated connector receiving a first end of each sense wire for connection to a corresponding connector of a wiring harness that is attached to the electronics module so as to connect the sense wires to the module; the plurality of battery cells is constrained between a pair of end caps, wherein each end cap includes a plurality of said sense wires extending across an outer surface thereof; and each end cap includes an integrated connector receiving a first end of each sense wire for connection to a corresponding connector of a wiring harness that is attached to the electronics module so as to connect the sense wires to the module; each end cap includes a plurality of spaced access holes there through, and pre-formed recesses which serve to retain fitted cell straps and which cover the access holes on interior surfaces on the end caps, the cell straps connecting the battery cells to power terminals, the cell straps (410, 710) and power terminal leads being welded to the cells through corresponding access holes; and each sense wire has a second spring end which extends through a corresponding access hole to be seated at a junction of a cell strap and battery cell exposed through the access hole so as to provide sensed data from the cell to the electronics module via the integrated connector.