Abstract: A jump starter for charging or boosting a depleted or discharged battery, the jump starting device, including a rechargeable battery; a positive battery connector for connecting the jump starting device to a positive terminal of the battery; a negative battery connector for connecting the jump starting device to a negative terminal of the battery; a power switch for connecting the rechargeable battery to the depleted or discharged battery when connected to the jump starting device during charging operation of the depleted or discharged battery; a first detector for detecting presence of the depleted or discharged battery connected to the positive and negative battery connectors; and a second detector for detecting presence of the depleted or discharged battery connected to the positive and negative battery connectors.

Abstract: A portable jump starter and air compressor device, including a jump starter, air compressor, and/or vacuum cleaner. One or more of the jump starter, air compressor, and/or vacuum cleaner are powered a same or different one or more rechargeable batteries (e.g. one or more Li-ion batteries). The air compressor, for example, includes a piston/valve arrangement configured to allow a piston of the piston/valve arrangement to move in close proximity to a cylinder head of the cylinder of the air compressor.

Abstract: Provided is a universal serial bus (USB-C PD) connector, including an oval-shaped plug having an end face, the end face having an oval-shaped outer rim, an oval-shaped recess located within the oval-shaped outer rim, an oval-shaped inner protrusion located within the oval-shaped recess, and an oval-shaped inner recess disposed within the oval-shaped inner protrusion, wherein the oval-shaped inner recess is provided with one or more electrical conductors.