While logged out of iCloud, for 24 hours, my iPad has lost 0% battery. My iPhone (logged into iCloud) is still losing a drastic amount of battery due to siri. If I am charging the phone or on LTE, siri does not run. As soon as I am on wifi and not charing, Siri just drains the battery nonstop. She is completely turned off!
hardware issue I guess. Especially if you set it up as new.