Long story short. I bought a used iPhone 5 that was defective cause the battery died in 2 hours and a half but Apple didn't help me because it showed as an inactive device on their servers. I was desperate cause I spent all my money on this phone so I took it to a repair service. They changed the battery, the charging dock and even the motherboard for lord's sake, and the problem persists! I've been without a usable phone for 4 months now and I just feel like crying cause I can't seem to find the reason for this problem and I can't buy a new one. What else could possibly be causing such battery drain????