@joshw, there is nothing wrong with it. As you pointed out in one of your comments to @tomchai the battery is fine. This is a prototype released by Apple of their new technology. The phones equipped with that type of battery were given to politicians on both sides of the isle during the last presidential race for final field testing. It is a hot air bag battery. Apple knows that politicians produce enough hot air to use it as alternative energy to keep it charged.
Samsung missed that goal altogether on their Note 7. I am sure you can find more information on wikileaks.org
Stay safe.