I have a 4gb iphone and just bought my wife an 8gb maybe 2 weeks ago. Her unit was a refurb, as was mine. It seems her battery life is HORRIBLE compared to mine. Just today we compared usage: Mine: 3hr 25min of usage, 4hr 23min standby: I have about 50-60% battery Her: 4hr 3min of usage, 5hr 36min standby: she was on 10% low battery warning So basically hers was used 40min more, with an hour more standby, but was about to die. I totally think that she needs a replacement. Is Apple pretty quick to send replacement units for this? Or do they chalk it up to user paranoia and make you live with it?