A remote control device (100, 200) for use in a load control system, the remote control device (100, 200) configured to be mounted over an installed mechanical switch (190, 290) that controls whether power is delivered to an electrical load, the remote control device (100, 200) comprising: a base (120, 220) that defines an opening (156A, 156B) that is configured to receive a protruding portion of a paddle actuator (192, 292) of the mechanical switch (190, 290) therein, the protruding portion of the paddle actuator (192, 292) projecting outward when the mechanical switch (190, 290) is operated into a position that causes power to be delivered to the electrical load, wherein when the protruding portion is received in the opening (156A, 156B), the base (120, 220) at least partially surrounds the paddle actuator (192, 292); a control unit (130, 230) that is configured to be attached to the base (120, 220), the control unit (130, 230) comprising a control interface and a housing (134, 234), the control unit (130, 230) further configured to transmit a control signal in response to a user input, the housing (134, 234) comprising an upper wall (141, 241), a lower wall (142, 242), and opposed side walls (143, 243), the housing (134, 234) defining a void (148, 248) bounded by the upper wall (141, 241), the lower wall (142, 242), and the opposed side walls (143, 243); a battery (180, 280) that is configured to power the control unit (130, 230); and a battery holder (170, 270) that is configured to retain the battery (180, 280) therein, the battery holder (170, 270) configured to be installed within the void (148, 248) defined by the housing (134, 234), characterised in that the battery holder (170, 270) is operable between a first position in a lower portion (148B, 248B) of the void (148, 248) and a second position in an upper portion (148A, 248A) of the void (148, 248). a base (120, 220) that defines an opening (156A, 156B) that is configured to receive a protruding portion of a paddle actuator (192, 292) of the mechanical switch (190, 290) therein, the protruding portion of the paddle actuator (192, 292) projecting outward when the mechanical switch (190, 290) is operated into a position that causes power to be delivered to the electrical load, wherein when the protruding portion is received in the opening (156A, 156B), the base (120, 220) at least partially surrounds the paddle actuator (192, 292); a control unit (130, 230) that is configured to be attached to the base (120, 220), the control unit (130, 230) comprising a control interface and a housing (134, 234), the control unit (130, 230) further configured to transmit a control signal in response to a user input, the housing (134, 234) comprising an upper wall (141, 241), a lower wall (142, 242), and opposed side walls (143, 243), the housing (134, 234) defining a void (148, 248) bounded by the upper wall (141, 241), the lower wall (142, 242), and the opposed side walls (143, 243); a battery (180, 280) that is configured to power the control unit (130, 230); and a battery holder (170, 270) that is configured to retain the battery (180, 280) therein, the battery holder (170, 270) configured to be installed within the void (148, 248) defined by the housing (134, 234), characterised in that the battery holder (170, 270) is operable between a first position in a lower portion (148B, 248B) of the void (148, 248) and a second position in an upper portion (148A, 248A) of the void (148, 248).