When I first got my 5 the battery life was pretty bad. However after reading online I found that a lot of others had the same issue. There was something about doing a restore of an older phone that was causing it. And that is what I had done- backed up my 3GS, and then had iTunes create a restore onto my 5.
I did a factory recovery on my 5 and instead of the battery being dead by the time I got home from work, I now shut it off at 10:00 with ~30% remaining.
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