Skype can be a battery hog in some cases, but you can set whether it stays open (that is, maintains an ability to accept incoming calls) when it's not the active app via its preference. I haven't done any scientific testing, but there seem to be enough people who have this problem to suggest that Skype may be the culprit. So, if you use Skype, and see bad battery life on your iPhone, try quitting the app and see if this improves things. There were no other apps running that would have been keeping a connection open, so it's safe to say - given the vast number of people who have commented on the relationship between Skype and poor battery life - that there is a link. I came across a Skype forum post where someone said they lost 70% in four hours, just like me. When I came home, I did some googling, thinking it could be Skype, or it could be another app. An hour later, my battery had only dropped another 5%. I thought of the usual culprits, like brightness (it's not at the maximum), Bluetooth (it seems well behaved with iOS 6, going in standby mode when not in use), or push email.
About 4 hours later, I saw it was down to about 25%, and I wondered what it could have been doing to deplete the battery so much. I was on the road for a bit the other day, and when I left home at noon, my iPhone's battery was about 95% full.
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