If you have Springtomize installed and having battery issues, I think I discovered the problem. Coverflow effect is what's causing it. I only have it on my dock on my iPad 4 but recently jailbroke my sister's iPad 4 and installed Springtomize. She did not want the Coverflow effect which was the only difference between our Springtomize set-up. She really did not see that much change in battery life. After talking with her, I turned off Coverflow effect and it's been over 24 hours and I can see improvement.