I put the Lenovo ThinkPad X220's 24-hour battery claim to the test | Windows Experience Blog
X230 New Laptop battery for Lenovo ThinkPad 9 Cell Lithium Ion Battery 44++ 94Wh Extended Life System Battery For X220 And X230|Laptop Batteries| - AliExpress
Record Breaker: Lenovo ThinkPad X220 Lasts Over 20 Hours | Laptop Mag
Lenovo's X220 ThinkPad with '24 Hour' Battery | WIRED
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
facelessloser on Twitter: "Not surprising but adding a 9 cell battery to my thinkpad x220 made it quite a bit heavier. Hope its better battery life then my old aging battery #ThinkPadX220 #
New Original 29++ Battery for Lenovo ThinkPad X220 X220i 42T4865 42T4861 42T4862 | eBay
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