What is the purpose of the middle pin in Lenovo laptop in a charging port? - Quora
DC Jack 7.9*5.0mm Power Connector Adapter L-Type for Lenovo Yoga Laptop Power Charger
Ac Dc Power Jack Connector Harness Plug Socket For Lenovo Ideapad Yoga 11 11s 13 (pj579) - Buy Ac Dc Power Jack Connector Harness Plug Socket,Dc Power Jack Connector Harness Plug Socket
Marc's Blog: linux - Hacking a thinkpad slim tip adapter to output more than 90W (required to charge a Thinkpad P70)
ATX 24 Pin to 10 pin Power Supply Cable For Lenovo motherboard 30CM· K8H6 | eBay
ChengHaoRan DC Tip Plug Connector Cord Laptop Power Cable For Lenovo ThinkPad Yoga Square Charger Adapter PC Cable Notebook|Computer Cables & Connectors| - AliExpress
Lenovo PA-2221-3 - 210W Power Supply for Lenovo ThinkCentre M410 M610 510S - CPU Medics