Oppo Find 7a must be defective, bluetooth takes very little battery life. I am thinking up until you had a bluetooth device you never turned it on, you finally turn it on and find the phone is defective.
My Note 3, I never turn off bluetooth off and I can not notice any battery drain.
Looked at the screen shop Android Wear is in some sort of wake lock.
Mine Android Wear is not even listed see Bluetooth at 3% but no Android wear.
You have some utility that maybe cause issue? I never use a battery conserving app they do not work.
or the device which I do not know may not be using 4.4?