Amazon.com: Aluo 42T4880 New Laptop Battery for Lenovo ThinkPad X220 Tablet X220iT Tablet Serie 42T4881 42T4882 42T4877 42T4879 42T4880 42T4879 52 Only Use in The x220 Tablet Notebook 52+ 10.8V 63Wh 5600mAh :
Amazon.com: Lenovo 6 Cell Battery 67+ (0a36317) For X220T Tablet and X230T Tablet : Electronics
29++ 9 Cell Battery for Lenovo ThinkPad X220 X220i
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
Dr. Battery Advanced Pro Series Lenovo ThinkPad X220 Series LLN224-AP 5200mAh / 57Wh Notebook Battery - BattDepot United States