Lenovo ThinkPad X220 review: Lenovo ThinkPad X220 - CNET
Lenovo's X220 ThinkPad with '24 Hour' Battery | WIRED
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Record Breaker: Lenovo ThinkPad X220 Lasts Over 20 Hours | Laptop Mag
Lenovo ThinkPad X220 notebook promises 24 hours of battery life | Digital Trends
Lenovo ThinkPad X220 really does get 20+ hours of battery life (sort of) - Liliputing
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3-pound ThinkPad has USB 3.0, killer battery life - CNET
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Lenovo ThinkPad X220 Review
Lenovo ThinkPad X220, X220i, X230i Battery
Wish this thing had better battery life : r/thinkpad
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