I got the new Watch Series 1 about 2 weeks ago and paired it with my iPhone 6 Plus. Battery life was as expected, after being at work all day I would come with about 45-50% charge left. This past Monday, got my new iPhone 7 Plus in, unpaired and restored the backup from 6 plus and paired it up to the new 7 Plus. Immedidatley after pairing with the iPhone, battery life has improved dramatically on the watch. Got home after the first day of being paired with a bit over 80% still left. Did not charge it overnight and got home after day 2 at work and still had 52% left. Is there major difference in Bluetooth between the 6 Plus and the 7 Plus? Something else that would explain the major change in battery life?