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 -
45N1712 45N1711 Original Internal Battery For Lenovo Thinkpad X240 X250 T440s T450s - WIT Computers
Lenovo ThinkPad X240, T440 notebooks get up to 17 hours battery life - Liliputing