Lab Tests: How long does the iPhone 5's battery last? | Macworld
Apple acknowledges iPhone 5S battery life issues - NotebookCheck.net News
Why does my iPhone 5s battery suddenly drop from 43% to 20% and then 10% suddenly? Is this battery to be replaced or is there something other malfunctioning? - Quora
FIXED] iPhone 5 Battery Draining Very Fast - Ian Lee - Marketer, Photographer.