I am also using CM10.1 nightly (5/31) and battery is OK to me. I can last at least a day w/ music, calls, email, etc. However, I ain't a heavy user!
Couple things you can try 1st before switching to other ROM are
(1.) Try to turn off background sync for unnecessary problem. For me, all my emails are checked manually, i.e. never sync.
(2.) Try to upgrade to the latest Google Play Store (4.1.10.) You can get it @AndroidPolice website. I heard 4.1.6 has a bug that drain battery.
HTH.