New 9Cell Battery for Lenovo ThinkPad X220T X230T X220T Tablet 42T4878 42T4881 | eBay
X230 6-cell battery re-celling considerations, 30+ and 44+ battery info [includes pictures] - Thinkpads Forum
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 44++ battery for X230 X230i (9 cell) 7800 mAh