Hands on with the ThinkPad X240: Two batteries are better than one | ZDNet
Lenovo ThinkPad X240 Review: Lenovo's ThinkPad X240 is a very different beast compared to the X230, but still one of the best small laptops on the market - Notebooks - Ultraportable -
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Laptop Battery 45n1775 for Lenovo Thinkpad T550 X240 T460 T440s X250 T450 X250 T460p - China Lithium Battery and Battery price | Made-in-China.com