No internal battery.  I believe all Lenovo t470 came with them.  Maybe Amazon terms of condition dont require this.  That's why 4 star but, I cant complain too much.  The external battery meets the 80% or better requirement.  But with only the external just about 2.5 hours life on preset battery saver mode.  Probably squeeze more out with tweeking settings.  With the internal I believe it would be atleast 4 hours.  Everything else is great so far!!  Like new condition. A little dust on fan but not much.  Blew it out no problem.Directions included to set up Windows without the invasive Microsoft account.