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
New 9Cell Battery for Lenovo ThinkPad X220T X230T X220T Tablet 42T4878 42T4881 | eBay
$40 and some elbow grease and my x230t now has better battery life than new. : r/thinkpad