NOVELTY - The safety circuit (18) has a detection circuit (28) operatively connected to a pair of output terminals (22) to detect whether the output terminals are properly connected to a low-voltage system with a correct polarity. A polarity testing circuit supplies test current to the output terminals and measures a resulting voltage to determine a proper polarity. A power controlling circuit controls power transistors (24) to provide electrical power to the output terminals using soft start procedure, when a proper connection of correct polarity is detected.    USE - Battery-integrated safety circuit for battery (claimed) e.g. discharged car battery and jumper cable. Uses include but are not limited to retrofit modules for installation on existing jumper cable sets, booster boxes, battery chargers, ground power units for aircrafts, temporary power units for recreational vehicles, standard vehicles, hybrid vehicles, plug in hybrid vehicles, marine vehicle, trailers, boats, and battery-powered equipment charging cords, direct current power connections for solar cells, fuel cells, direct current generating equipment, direct current power connections for electronics.    ADVANTAGE - Power controlling circuit provides electrical power only when a proper connection of correct polarity is detected. Soft start procedure eliminates inductive voltage spikes which could cause damage to sensitive electronic components of low voltage systems. Size of the safety circuit is small, so that it can be used in-line with the connecting cable. The polarity of the terminals can be corrected without the need for removing or reconnecting previously made connections between low voltage systems and user convenience is improved.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a battery containing a battery-integrated safety circuit.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic block diagram of safety circuit.    Safety circuit (18)    Output terminal (22)    Power transistors (24)    Detection circuit (28)    Alarm (30)