I have a T480s as well as a T25 (let's not talk about the x300, x220 and earlier stuff I have, being used as bookends; I did have a 701 but sadly threw it out, much to my chagrin in recent years), and the T480s gets used more often, simply because it's more portable. Plus, a rare slim laptop with that neato expandable RJ45 plug, when newer slim laptops nowadays forgo the same.

The internal battery can be readily sourced and replaced easily enough.

My latest toy is a GPD Win Max 2, keyboard isn't too bad actually, but I doubt it will last anywhere near as long as the T480s.