Exactly. There must be something else involved. I mean my battery spent like 6% in 4 hours while surfing a bit, read few emails and everything is on (no trick or tips or any optimisation) except bluetooth as I never use it except when I use the external GPS. Same goes for my Iphone 5. I would say a good test would be, 1. Reset to factory default. 2. Test it for a couple of days 3. add a couple a applications a day and watch where it start to downgrade. As the only thing I did is full reset and reboot after the upgrade. I don't have many applications (office suits, webex, gotomeeting, photography, and various GPS software) and no games at all. All graphics setting are on. If I don't use them much both the ipad mini and Iphone 5 last at least 2 days. my update was OTA. it is indeed puzzling same hardware, same ios and radically different results.