With the update you can really narrow down which apps are draining your battery. After seeing what Facebook was doing in the background I have been closing out the app and have seen a dramatic increase in battery life.
Yup no matter what you do it keeps running in the background. I close it out after every time I use it now which seems to be working. I'm considering deleting the app though.
Turning off background refresh doesn't seem to affect it though. I have done it for that app and my main messenger app. Neither have seen a dramatic decrease in background usage. I'm wondering if the settings even work at this point.