We recently saw that the battery on the new iPhone shouldn't be as good as the 4S. The repair firm iResQ has now just released alleged images of it, "confirming" just that, see s:
The differences are few, with the battery of the future model being less than half an inch larger than the current one and of the same thickness. They also "confirmed" that the new one has 3.8V and 5.45Whr, while the iPhone 4S has 3.7V and 5.3Whr.
Soon we will know if Apple managed to operate a miracle, increasing the autonomy of the sixth generation iPhone, which is not very likely, given the history of upgrading the models to this day.