When you look at your battery stats what is using the most percent? If it is the cell standby or phone idle then I would turn off your phone and remove the 4g card and then reinsert it. I had a problem where my battery started to drain very fast and the primary hog was my cell standby. I tried everything from new kernels to several roms and nothing worked. I finially fixed it by simply removing the 4g cars and reinstalling it.