A battery pack for use with a battery pack receiving member of a machine so that the battery pack is operable to supply a suitable amount of power to the machine for operation of the machine, including: an electrical circuit path (150,250) that is configurable for electrically-connecting the battery pack to the machine so that the suitable amount of power is able to be supplied to the machine, the electrical circuit path (150,250) including a primary electrical circuit path that is configurable for electrically-connecting output terminals of the battery pack to an electrically-operable motor or actuator of the machine when the battery pack is connected to the battery pack receiving member of the machine, and, a secondary electrical circuit path that is configurable for electrically-connecting a plurality of discrete battery cells of the battery pack in series or parallel; and an electrical switch (110,210) including: a first electrical contact member disposed along a first region of the electrical circuit path (150,250); and a second electrical contact member that is movable relative to the first electrical contact member along said first region of the electrical circuit path (150,250); wherein, responsive to the battery pack being connected to the battery pack receiving member of the machine, the second electrical contact member is configured for movement relative to the first electrical contact member to cooperatively form a first configuration in which the electrical switch (110,210) closes the electrical circuit path (150,250) via which the suitable amount of power is able to be supplied from the battery pack to the machine; and wherein, responsive to the battery pack being disconnected from the battery pack receiving member of the machine, the second electrical contact member is configured for movement relative to the first electrical contact member to cooperatively form a second configuration in which the electrical switch (110,210) opens the electrical circuit path (150,250) so that said output terminals of the battery pack are electrically isolated from at least one of the plurality of discrete battery cells and a suitable amount of power is not able to be supplied from the battery pack to the machine via the electrical circuit path (150,250). an electrical circuit path (150,250) that is configurable for electrically-connecting the battery pack to the machine so that the suitable amount of power is able to be supplied to the machine, the electrical circuit path (150,250) including a primary electrical circuit path that is configurable for electrically-connecting output terminals of the battery pack to an electrically-operable motor or actuator of the machine when the battery pack is connected to the battery pack receiving member of the machine, and, a secondary electrical circuit path that is configurable for electrically-connecting a plurality of discrete battery cells of the battery pack in series or parallel; and an electrical switch (110,210) including: a first electrical contact member disposed along a first region of the electrical circuit path (150,250); and a second electrical contact member that is movable relative to the first electrical contact member along said first region of the electrical circuit path (150,250); a first electrical contact member disposed along a first region of the electrical circuit path (150,250); and a second electrical contact member that is movable relative to the first electrical contact member along said first region of the electrical circuit path (150,250); wherein, responsive to the battery pack being connected to the battery pack receiving member of the machine, the second electrical contact member is configured for movement relative to the first electrical contact member to cooperatively form a first configuration in which the electrical switch (110,210) closes the electrical circuit path (150,250) via which the suitable amount of power is able to be supplied from the battery pack to the machine; and wherein, responsive to the battery pack being disconnected from the battery pack receiving member of the machine, the second electrical contact member is configured for movement relative to the first electrical contact member to cooperatively form a second configuration in which the electrical switch (110,210) opens the electrical circuit path (150,250) so that said output terminals of the battery pack are electrically isolated from at least one of the plurality of discrete battery cells and a suitable amount of power is not able to be supplied from the battery pack to the machine via the electrical circuit path (150,250).