Bay Valley Parts®Lenovo 6-Cells 11.1V 5200mAh Hi-Quality Replacement Laptop Battery for THINKPAD X220T,X230T,X220 Tablet,X220I Tablet,X230 Tablet,X230I Tablet Series
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Lenovo ThinkPad X220 and X220 convertible tablet official, 24 hours of battery life promised | Engadget