Horrible battery life, 9.2 beta 4

I've done two clean installs with this beta, and the battery life *****. I went from 70% to a dead phone (5S) overnight on one occassion, with nothing significant happening on the phone. Worst battery performance during a beta to date, and I've been running betas since iOS 6. Anyone else experiencing the same? Not promising considering the beta hasn't been updated in three weeks. I hope the production build isn't anything like this. I'm tethered to a charger like I used be with my 3GS...