Battery Pack Assembly

A battery pack assembly () comprising two holding frames (), wherein the two holding frames () hold a plurality of cells () between them, each cell () being held longitudinally between the two holding frames (), wherein two or more of the plurality of cells () are connected by a conductive means (), and wherein the two holding frames () are reversibly held together by a fastening means (), wherein the fastening means () cause terminals of the cells () to be urged against the conductive means () and removal or loosening of the fastening means () enables the cells () to be freed from the assembly (), at least one holding frame () comprising one or more elastomeric protrusions () and wherein the conductive means () are positioned such that parts of them lie between one or more elastomeric protrusions () and one or more cell terminals, such that the urging of the frames () together by the fastening means () causes the conductive means () to be urged into contact by the elastomeric protrusions () with said one or more terminals.