A portable or handheld jump starting and air compressing apparatus for jump starting a vehicle engine and air inflating an article such as a tire. The apparatus can include a rechargeable lithium ion battery or battery pack and a microcontroller. The lithium ion battery is coupled to a power output port of the device through a FET smart switch actuated by the microcontroller. A vehicle battery isolation sensor connected in circuit with positive and negative polarity outputs detects the presence of a vehicle battery connected between the positive and negative polarity outputs. A reverse polarity sensor connected in circuit with the positive and negative polarity outputs detects the polarity of a vehicle battery connected between the positive and negative polarity outputs.

A rechargeable battery jump starting device with a dual battery diode bridge system. The dual battery diode bridge, for example, is configured to protect against a back-charge to a first 12V battery and/or a second 12V battery after a vehicle has been jump charged to prevent damage thereto.

A rechargeable battery jump starting device with a control switch (e.g. rotary control switch) and an optical position sensing switch system to determine the position of the control switch. The optical position sensing switch system includes an optical position sensor using optical coupling to insure the integrity of isolation on the 12V to 24V master switch to allow for a safe and effective operation, and configured so that the microcontroller unit reads the position on the master switch.

A rechargeable battery jump starting device with a leapfrog charging system. The leapfrog charging system, for example, can sequentially charge multiple batteries of the rechargeable battery jump starting device.

An electric switch, in particular for manually operated electric tools or appliances with an electric motor, is switchable from outside by means of a plunger. A changeover device is provided for setting the direction of rotation of the electric motor, which changeover device can be activated for example by a tappet arranged on the outside. The switch is constructed very compactly, which simplifies the sealing of a switch of this type.

An electric switch, in particular for manually operated electric tools or appliances with an electric motor, is switchable from outside by means of a plunger. A changeover device is provided for setting the direction of rotation of the electric motor, which changeover device can be activated for example by a tappet arranged on the outside. The switch is constructed very compactly, which simplifies the sealing of a switch of this type.

A rechargeable battery jump starting device with a vehicle or equipment battery detection system. The vehicle or equipment battery detection system is configured for detecting the connection of the rechargeable battery jump starting device with the vehicle or equipment battery to be jump charged.

A battery master disconnect switch includes a front panel and a back panel. The front panel has a selector knob for selecting between multiple positions. The back panel has a primary terminal, a secondary terminal, and an auxiliary terminal. The primary terminal is for connection, using a first cable, to a primary battery. The secondary terminal is for connection, using a second cable, to a secondary battery. The auxiliary terminal is for enabling a device. The device receives power for any of the positions of the selector knob. The battery master disconnect switch can present a voltage for the primary, the secondary, or both the primary and secondary batteries.

A rechargeable battery jump starting device and a battery frame for use in an electronic device such as a portable rechargeable battery jump starting device. The rechargeable battery jump starting device maximizes the power conducted from the rechargeable battery to a battery being jump started.

A rechargeable battery jump starting device with a dual battery diode bridge system. The dual battery diode bridge, for example, is configured to protect against a back-charge to a first 12V battery and/or a second 12V battery after a vehicle has been jump charged to prevent damage thereto.