Abstract: A battery jumper cable assembly for automatically assuring the safe connection of two storage batteries in a parallel relationship for charging the batteries or starting a motor vehicle which has a dead battery. Four normally open solenoid switches are included in the circuitry to align the two batteries automatically in proper polarity regardless of how the terminals of the two storage batteries are actually connected. An indicator light glows continuously when the hookup is completed and operating.

Abstract: An apparatus for testing storage batteries under no-load and load conditions is provided which limits the duration of a test of any battery having adequate charge capacity and thereby protects both the apparatus and the battery from the hazards of excessive current. The battery testing apparatus includes a load circuit having current responsive switch means that automatically opens when its predetermined amperage rating is exceeded to provide a load test having a duration corresponding to the reaction time of the switch means. A voltage indicator, including a lamp or a voltmeter, detects and indicates the relative magnitude of the voltage available between the terminals of the battery so that the charge capacity of the battery can be determined both under no-load and load conditions. An ammeter may be also included for measuring the current passing through the load circuit during the load test.