I fried a Boron, and am trying to troubleshoot. Could applying 3.3 V from a voltage regulator to the Li+ pin cause damage? I see that is below the range:
This pin is internally connected to the positive terminal of the LiPo connector. You can connect a single cell LiPo/Lithium Ion or a DC supply source to this pin for powering the Boron. Remember that the input voltage range on this pin is 3.6 to 4.2 VDC.