When I saw your first picture I thought it was of an insulated pizza carrier.
By the time it could arrive from Amazon (should I order it today) it would probably arrive either after I've got a replacement Note from my carrier, or by then I might have lost the battery lottery (shouldn't we call that type of thing a loss as opposed to a win?).
Besides a lack of ventilation and looking frail/thin/weak it looks like it wouldn't fit the area needed for a plug-in cable to the USB-C port, and if it does it might bend the wire in a way that it will stop functioning after awhile. It also would likely be too thick to work up against a wireless charging pad (people seem to have enough problems getting it to charge through cases).
Maybe I'll start charging mine on the fireplace (not to the point of being so parinoid to stick it in the fireplace while charging, yet
). I just charged it to 100% this late morning/early afternoon, and have it running in maximum power saving mode when I'm not using it so hopefully I will not have to charge it again before replacements are available.
I was charging mine the morning of the announcement (started right before I hopped on the phone and read it), and then again today. Like you I'd been constantly monitoring it, and like you mine barley gets warm. That morning of the announcement I was pretty confident that I don't have to worry about it, and that my phone seems fine. However as more and more time passes I get more paranoid that what is fine one minute could fail the next. I'm not paranoid enough to stop using it, but enough that I'm going to be more cautious if i have to charge it again in the future before te replacements are available.