AC Outlet Portable Laptop Power Bank, Universal 31200mAh 100W Travel Laptop Charger & Fast Charging External Battery Pack for MacBook, Acer, HP, Samsung, Dell, ASUS, Lenovo, Notebook : Amazon.co.uk: Computers & Accessories
Product | Lenovo Go USB-C Laptop - power bank - Li-pol - 20000 mAh - 74 Wh
T480 External Batteries : r/thinkpad
ThinkPad External Battery Charger - Overview and Service Parts - Lenovo Support IE
EX7L 98Wh Laptop External Battery Power Bank for Lenovo ThinkPad Carbon Ultrabook IdeaPad Helix Flex Yoga Notebook Rectangle or Circular Connector USB QC Fast Charging Tablet Smartphone - Newegg.com