I've been having some major issues with my droid razr for awhile now, with it going from full charge to dead in 4 and a half hours, 2 hours screen on time. LTE is on, wifi, GPS, Bluetooth are off and the phone is at auto brightness. All of my usage is just texting, twitter, web browsing and Facebook, nothing intense. I sent in my old phone because I thought it might be that the battery was not holding charge, but my "certirfied pre-owned" phone came in yesterday and has the exact same battery life as my old one... Any help?