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What version of CM are you running on it? I'm on CM12.1 nightlies and no battery issues at all at the moment, but the nightly from a week or so ago was pretty battery hungry.
I'd suggest downloading wakelock detector to see if anything's keeping the phone from sleeping. I think this needs root?
Also, the OPO's built in battery stats page should tell you the biggest battery hog.
the battery on my oneplus is playing up again!!!! I charged it fully at work today at about 4pm and now it only has just over half left, the phone has been only standby pretty much since... what now??? Anyone?