It seems like @allObjects is saying connect the battery to V_out (a.k.a. VBAT), and @Gordon is saying connect it to V_in (a.k.a. BAT_IN) in order for the board to be able to handle any voltage between 3.7V and 16V. BAT_IN makes the most sense, so that is what I'm trying. I stacked up 2 CR2032 batteries to total 6.3V (approx.), and the red light constantly shines (which is what I got when I didn't have enough voltage, e.g. a single CR2032). What could that light mean this time?
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