The HP ProBook 650 G1 DC jack charging port is designed for the HP ProBook 650 G1 and 655 G1 series laptops. Common part numbers for this component include 727811-SD1, 727811-FD1, and 727911-FD1. It features a barrel-style DC input jack with a 4-pin connector, ensuring a secure power connection. The charging port is compatible with HP's standard 18.5V 3.5A AC adapters, providing reliable charging. The port is typically either soldered onto the motherboard or connected via a cable assembly, depending on the specific laptop model.