Also of interest... the contacts on the bottom of the
battery are always hot and I suspect they bypass the "intelligent" of the
battery and are just connected right to the internal
battery pack.
Makes me a little nervous seeing those hot pads exposed like that... you definitely don't want to toss that
battery in your pocket with your car keys! (the ~6 pin connector on the other hand is
much less likely be contacted by something as thick as car keys, and isn't providing power while the
battery is "off") I'm tempted to tape them over as a precaution as they serve no purpose if you don't have the charge station.
And I'm waiting for DJI to come out with a charge landing pad mode or something that enables the Spark to home in on and "dock" with its charger and sit there and top off its
batteries automagically. Maybe not terribly practical, but definitely cool, a bit like how the roombas etc go dock and charge themselves. They've got the "precision landing" thing working (sort of?) so this may be in the cards.