Not Green Cell, but I got a 6 cell replacement from GHU for my T440s workhorse. For the first week, it reported 9+ hours on a charge. Super cool, I thought, I can basically work outside as long as I like. The second week it went down to 2 hours on a full charge. 50USD down the tubes. I'll pay the premium for OEM batteries from now on. This, of course, was just my experience, but reviews suggest it is a common one. I just thought it would be worth the risk.

So good to see you here, PoppinKREAM, after the reddit debacle. It gives me hope for the kind of informed, careful, and comprehensive analysis on Lemmy which is, after all, your calling card.