I had the exact same problem after jailbreak. I did a complete restore from scratch and it fixed the problem. I went from having everything off 3g, location, wifi and push and having 19% after 12 hours since recharge. To now having absolutely everything on and having 24% left after the entire day of heavier use, browsing texting phone. It's a huge difference. Don't know what caused it, but I'm nervous about jailbreaking now. Anyways good luck.