When I beta-tested 1.3.* I had a really huge battery issue. It was Telegram apps that was eating everything. To solved it, in Telegram, deactivate “smart push” in Settings -> Notifications and Sounds.
Otherwise I advice you to install Better Battery Stats and to read this, it is very informative, particularly about “Wakelocks”: Wakelocks in Android (FP1(U)/rooted FP2)