> I like to buy ex-corporate ~5 year old Thinkpads, get from a seller who gives atleast 6 months warranty

I am curious if this a US thing only. I mean, I've heard of company vehicles in second hand market but never company laptops. In my experience all these company laptops get decommisioned by IT never to remove any data, but I never really considered what happens at End-of-life for those.

A few questions:

1. Where do you find these retailers?

2. Where do you find suppliers selling new batteries for old devices?

(all of my previous attempts at finding replacement batteries for laptops and e-readers always resulted in very poor performance or even faulty battery packs)

edit: formating paragraphs for questions