18hr of battery with the display off is a killer, and even if you could get an m.2 modem working in it m.2 modems tend to be far less efficient than the ones integrated to cell phone hardware. At least it my experience with Quectel and Sierra m.2 modems is representative of other brands.

And exactly this is why you should always make sure to change the message text when asking a seller something.

I haven’t sold anything for several years but have purchased several items with multiple interested buyers lately sold on a first to come gets it basis.