A connection arrangement enables rapid connection and disconnection of a cable wire (11) to a post-shaped automobile battery terminal (12). A battery terminal connector (16), has a platform (17) with a front end forming a post-receiving hole (18) that receives the battery terminal, the platform having a rear end with a pair of stationary shoulders (21) and a pin contact (22) lying between the shoulders. A cable connector (25) includes a socket contact (26) that can connect to the battery connector, and a locking device. The locking device has a pair of clamp arms (31) that are resiliently biased together but that are deflected apart by a separator (38) until the arm shoulders (35) snap behind the stationary shoulders.