I daily drive t450 i5 5300u to this day.

I swapped ssd, 8gb ram 4x4 dual channel, and it has windows 10 on it.

I can basically do every light tasks without much of discomfort. It is slower than modern pcs obviously but It is fast enough to google search and watch youtube.

When I bought T450(like 5-6 years ago), general consensus was that do not get the Haswell 4th gen 22nm intel cpu or below.

5th 6th and 7th gens are 14nm and has better power efficiency and way better igpu performance that it was a huge jump for the laptops. (Desktop was different as 2th~4th gen could push more mhz and rival 5~7th gen by feeding more power)

I can’t remember well but it was $250 refurbished when I got it from the best buy and it is like $180 now on amazon and walmart.

I would recommend this for any kids or older folks who doesn’t know much about Pc. Old Thinkpads are made like tanks, it just won’t break. But if you are any techie person, just buy modern day thinkpads.

Modern phone/laptop batteries are best kept around 60% (40~80) for longevity. Batteries lose most capacity when fully discharged and then fully charged, and then repeating said cycles.