We're talking about a LEnovo T420 though.
Given the number of laptops I tested this on, from various manufacturers, seems like something could be done better.
At least for Lenovo laptops, that we know for sure are able to report cycle count
Just to confirm this is not working on a Lenovo T420. As you know, Lenovo T series display this information in their Power Manager software, so the firmware is not the issue.
Dell Latitude E5540 and E5550 also do not display this.