I did not see the caveat in the documentation concerning leaving the battery plugged into the shield, and it seems that my battery has completely discharged. Despite the fact that I received version 2.0 of the battery shield, the shield becomes very hot to the touch while recharging. I think the heat was mostly localized to the USB side of the shield, but since I do not want to blow up my LiPo battery, I did not leave it hooked up long enough to investigate.
Does anyone have any comments on this? Is it safe to recharge the battery when the shield behaves in this manner?