Aluo X220T 11.1V5600mAh/63wh 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+ - Walmart.com
Lenovo 0A36282 Thinkpad Battery 29+ (6 cell) for X220 Series - Newegg.com