Abstract: A lock for securing an automobile storage battery of other automatic accessory from being stolen when the vehicle is left unattended, the lock consisting of a pair of L-shaped brackets securely mounted on an existing battery tray replacing the battery hold-down, the brackets being formed of a carbonized steel and provided with horizontally extending slots in the upper ends of each vertical upstanding member through which opposite ends of a double ended sliding double bolt operated by means of a key cylinder lock project when the key is turned by the operator.The key cylinder is imbedded in a steel cover for the rectangular container containing the bolts and the locking bar is centrally and pivotally mounted on the lower end of the cylinder by means of a shear pin which, when the key is removed from the lock, will shear upon any attempt to drill the cylinder and hence be unable to function for disengaging the bolts from their engagement with the brackets enclosing the battery.