I have around 80mb free usually. My advice like I said earlier is to remove any app killers you have, reboot your phone, and LEAVE IT ALONE. Killing apps will just eat up more ram and more battery. I use my phone heavily and I always have plenty of battery left at the end of the day. App Killers = Bad. If you want Facebook on your phone, then install it and LEAVE IT ALONE. If you want to use it occasionally then either 1.) Use a browser for regular facebook or 2.) uninstall the app when you're done using it... I don't know what else to tell you guys.