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
44+ Battery for Lenovo ThinkPad X220 X220i X220s X230 X230i 45N1019 PC 4400mAh | eBay