Yeah, the OP was obviously JB at one time. Some of the JB stuff can remain even after you get un-JB. However, it looks like 3.1 got rid of the meter, and there's really no way to get it back. The OP could go through the process of downgrading a 3G that they've talked about in the forums, but I seriously doubt he'd have the battery meter after that, unless he could then restore from a backup, if he even has one pre-3.1.