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Lenovo ThinkPad X220 Review - Notebook Reviews by MobileTechReview
Lenovo ThinkPad X220 really does get 20+ hours of battery life (sort of) - Liliputing
Lenovo ThinkPad X220 Hands On, Details, Specs And Video
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Lenovo ThinkPad X220 review | Engadget
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Lenovo ThinkPad X220 Review
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ThinkPad X220 versus ThinkPad X230 with 19+ battery slice | Flickr
the slice battery was too expensive, but i had a better idea : r/thinkpad
