When cold, it is better to use a native battery. The voltage of the multi-interface connector is not even up to 3 volts, which sadly affects compatibility through an adapter with active interface devices, where it is much larger. With puffs, through an adapter to a quick-release connector, it behaves well. It would be cool to be able to select the focus point on the display, but then one could not dream of a folding screen due to the fragility of the design; so it's better as it is, the more tracking AF, one might say, is not here.