So, a 3rd party says the battery lasts 4 hours, while Lenovo claims 10 hours? There are two different batteries available (I think this is true for all X model

So, a 3rd party says the battery lasts 4 hours, while Lenovo claims 10 hours? There are two different batteries available (I think this is true for all X models). One is about double the size of the other and the 10 hours quote on the Lenovo page is "up to", so is the larger battery. My guess is that the original poster has the other one (which is more compact). [Disclaimer: another X60 user here]