..or any way to charge the battery without adding the USB shield.
Because you don't want to dismantle a smartwatch or your tiny console to charge it.
It doesn't really need to be a shield, it could just be a thing pluggable between the battery and the board (female for the battery, male goes into the TinyDuino).
µUSB (female) -> sending "inductor"
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Battery -> receiving "inductor" -> TinyDuino board
It can be physically placed below the main board (or anywhere else really) with some tape.