[mmosta]

Pretty cool.

I'm interested in knowing which component failed? did the second card fail in the same way? or was that remedied in the revision?

Did the display and button still work?

Hopefully the issue was with the coil, flex PCBs and displays are more or less a solved problem, batteries not so much.

With the Nordic 51822 they're lined up well to roll out NFC after the mandated phase out of mag-strip in the US (p.s how are they still a thing?).

It'll be interesting to see if they'll survive if a chip-and-pin foothold overshadows NFC.