Okay, so I’ve been hit with the battery drain issue as well, for me it’s on an iPad Air 2 updated to iOS 11.4 the day it came out. It should’ve already done the indexing. To see how fast it drains I fully charged it last night before going to bed and then unplugged it. This morning it was down to 85%. I quickly put it back to sleep and left for work. I just came back at 6pm and checked, it’s now at 59%, in complete stand by. This is pretty irritating... Some days I’ve found it totally dead. Anybody with battery issues on their Air 2? [solved] 11.4.1 seems to have fixed the battery drain issue.