ios 8.3 battery life

iPad Air 2. Brightness 100% and almost everything off. I'm waiting iOS 8.4 update and iOS 9.

I've got an 5s, my battery life is killing me, it is on 8.3 IOS and don't really have a clue to what has happened to this phone. The longest battery time i have experienced so far is 8 hours in a row. Hate this !!!

my 4s and ipad air. Seriously both devices are like new I reckon I gained 30% improvement. My iphone has been on all day and still got 63% battery thats 12hrs and about 5 calls.

My ipad hasnt seen a charge for at least 3 days with use and its at 73%

I updated from iOS 8.3 to iOS 8.4 and the battery life now even worse! (iPad Air 2 - 128GB, brightness 100% and almost everything off)

I take back what I said after several days my iphone is far worse my ipad no difference.

I have updated to 8.4 and my problem initially was solved with my iphone 4s. again normal battery usage, large difference between standby and usage time. after full charge, leaving the phone alone after 5 hours still 100 procent. me happy.........till today

again the same problem of drainage of the battery, yesterday everything ok, today again the same problem.

i've checked which apps had an update and facebook was one of them, could this again be the problem causer?

anyone else with 8.4 and problem solved or not?

.