Lenovo Thinkpad X220 29+ Laptop Battery - Ok Computer Plus
Lenovo ThinkPad X220 and X220i Battery Replacement for 29+ – Gentle Computers
Amazon.com: Lenovo ThinkPad 9 Cell Lithium Ion Battery 44++ ( Manufacturers P/N; 0A36307 ) 94Wh Extended Life System Battery For X220 And X230 Laptops Only : Electronics