Just ordered the cheap Chinese 9-cell super battery that Lenovo never made for this Thinkpad X220T tablet so that I can get more than 40 minutes of battery life off of what's
Lenovo ThinkPad Battery 52 (3 cell) for Thinkpad X220T/X230T -Genuine New | Shopee Malaysia
I put the Lenovo ThinkPad X220's 24-hour battery claim to the test | Windows Experience Blog