Thinkpad X230 - Finally able to bring my laptop for a whole day after a 9-cell battery upgrade : r/thinkpad
ThinkPad Battery 44 (4 cell), ThinkPad Battery 44+ (6 cell) and ThinkPad Battery 44++ (9 cell) - Overview - Lenovo Support IL
Lenovo ThinkPad 9 Cell Lithium Ion Battery 44++ ( Manufacturers P/N; 0A36307 ) 94Wh Extended Life System Battery For X220 And X230 Laptops Only - Walmart.com
29++ 9 Cell Battery for Lenovo ThinkPad X220 X220i
X230 New Laptop battery for Lenovo ThinkPad 9 Cell Lithium Ion Battery 44++ 94Wh Extended Life System Battery For X220 And X230 - AliExpress