A battery cut-out device (11) has a housing (13) which interposes between a battery terminal and the vehicle lead that connected to the battery terminal. At one end (17) of the housing a first high current capacity termination (18) to connect to the battery terminal, and at the other end (21) of the housing (13) a second high current capacity termination (22) connects to the battery lead. A fly lead (25) extends from the housing (13) which connects to the other battery terminal to provide power to electronics in the housing. Also located at one end of the housing is a press-to-make momentary push button switch (27) which is provided to perform a reset function, and an LED indicator (29) which is provided to show the operational status of the battery cut-out device (11). The reset function electrically connects terminations (18) and (22), and the electronics disconnects these terminations if the battery voltage falls below a predetermined level.