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Lenovo's X220 ThinkPad with '24 Hour' Battery | WIRED
Lenovo 0A36282 Thinkpad Battery 29+ (6 cell) for X220 Series - Newegg.com
Amazon.com: Lenovo 6 Cell Battery 67+ (0a36317) For X220T Tablet and X230T Tablet : Electronics
Lenovo 0A36307 ThinkPad Battery - Newegg.com
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
Lenovo ThinkPad X220 and X220i Battery Replacement for 29+ – Gentle Computers