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In case anyone still care about the first gen oasis, using 5v against the top-most (gnd) and the bottom pin (vcc) can charge the device. But the device won't show any charging signal.
I previously thought it would just be a micro-usb port, but then realized the charging case itself had no usb port. So likely the middle three pins are either for charging the case or negotiating between the reader and the charging case to decide which one supplies power.
Since now the charging case cannot be sourced anymore, building a docker with a usb port would be beneficial. I made one with two magnets + two pogo pins + a piece of plastic + a usb cable + some hot glue.
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