Hello there!
if you want to turn off app refresh for Facebook go to Settings > General > app refresh.
You can also see the following tips to maximize
battery performance
Troubleshooting iPhone Battery Draining:
Refer to the Following:
I. Upgrade Once More:
Upgrade to the latest update.
Go Here: Update your iPhone Using a Computer - User Tip
II. Report this to Apple:
Do your part: Let Apple know what is going on here. Provide them with feedback on this. They may not get back to you directly, but the more feedback they received on this, the more they will know what is going on, and what needs to be fixed in updates to come.
- Go Here: Feedback - iPhone - Apple
- Comment: on when the issue began, and how you have troubleshot it thus far.
- Select: "Bug Report" for the "Feedback Type"
- Proceed from there aw necessary
II. Troubleshooting iPhone Battery Draining:
Refer to the Following...
A. Battery Drain Info:
The iPhone battery will drain, unless it is plugged in and charging. With lots installed, the charge would be slower. As for how fast it would drain the battery, that would depend on the battery health and the volume (sound) you use.
- Go Here: iPhone Battery and Performance - Apple Support
- Scroll Down: to "Your battery's maximum capacity"
B.. Troubleshooting the Battery: