Thanks for your kind responses, both low and high technical electronics levels :thumbsup: I really don't have more than one good charger to look at closely (Nitecore D4). I've been reading the wonderful reviews here and my curiosity about temperature sensing was piqued, but the pics don't help me see how temp sensing might work. I asked because it seemed to me that a sensor that requires contact for conductive heat transfer would be difficult to pull off in a reliable way on a cell stuck sideways into one of these chargers. I'd be looking for a compressable, conductive pad of some sort unless primary heat transfer from battery to the charger element is radiative. That is a whole nother can of worms.
I continue to think that sensing through the electrical contacts should work, but there is probably a pit-fall that I am not considering.
There are other difficulties with the temp sensing control that I am curious about. Has anyone ever put a charger in an idle refrigerator or other warm box, started the charger and then cooled the environment down to see what happens?
Sorry for my slow response with thanks. I am relatively new here. Before I sleep again, I have to look to see if my account is configured for email notification with responses. I thought it was.