This is the internal Battery for your laptop. The health status on this battery can be seen by checking your Lenovo battery management software on your laptop. It is easy to replace by removing the screws at the 4 corners on the bottom of your laptop.

You can expect about 5 - 6 hours of run time with this ThinkPad X240 battery when new, depending on your energy use.

This battery replaces the Lenovo x240 T440s T450s series laptop batteries and a host more which are listed at the extreme bottom of this web page.