Travel a lot, accidentally left my old power bank on a plane, got this really cool one to replace it. Charges z13 from empty to full with 30% to spare. : r/thinkpad
Source Laptop batteries 11.1V 7800mah Laptop Battery For Lenovo ThinkPad A36303 45N1000 T430 L430 L530 T530 W530 Series on m.alibaba.com