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 0A36307 ThinkPad Battery - Newegg.com
Lenovo's X220 ThinkPad with '24 Hour' Battery | WIRED
X220 with 9 cell battery is awesome. : r/thinkpad
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Original 29++ (9 Cell) 0A36283 Laptop Battery for Lenovo ThinkPad X220 – eBuy INDIA