Have you done a factory reset?
Ok, Well it may be in order then. Here's some interesting things I have noticed through my own trial and error since I updated ota. My battery times were ok I wasn't having that much of a problem with it, but my phone was slighty laggy. I suspected a few apps were conflicting a bit so I gave it about 2 days before I did the Factory reset. Here's where I noticed the difference in my battery times.
The first factory reset I did I backed up my app data through the process of the fdr when it asked me before I wiped it so that it would restore all my apps back with their settings still in tact. Well after my phone reset I let google services add everything back for me with all the app settings in place. Worked smooth and worked fine. Everything went back on my phone without a hitch. But my phone got laggy really bad. I gave it a couple of hours and realized the apps settings I put back in place just made the reset even worse. Made my battery times worse also. So I went back and did another factory reset, the process only takes about 5 minutes so I figured why not. Here's where things changed for me. I just did a factory reset with no backed up app setting. When it asked if I wanted to let google reinstall any apps and contacts with their settings after the re-boot of the reset I said no. I re-installed all my apps back fresh and clean. NO backed up settings. WOW what a difference that made with my phone. It then acted like it did before I upgraded to ICS. My Razr was bad ass again. My battery times are better and it runs silky smooth. I'm assuming a lot of the problems was the apps still had all their settings set to GB. With a factory reset and no backed up data from the apps and a clean install of them all my problems disappeared and that's when my battery time got even better.
With Foxkats battery meter training of course...That really made it better.
Hey don't feel bad that's what I had to do lol. But I'm telling you it made a world of difference with my Maxx. I remember when froyo switched to GB my Droid X completely geeked out. I did the exact same thing with it and just wiped it and put everything back on new again. It acted right immediately after that. So I tried it again with my Maxx this time around after being greedy and hoping the 1st reset would solve my problem. Fresh everything solved all the problems I was experiencing. Maybe this will help you and others out. It's definitely solved all my problems. Laggy feeling, better battery times, the overall feel of the phone is fantastic. I was discouraged at 1st with the update, but just wiping it and putting everything else back on from a clean state worked WONDERS! It was a pain, but all problems have been solved.
There's a new ICS leak out that supposedly addresses battery issues. Its .214
I have heard mixed reports, some said 10%, others say it's still 15%. I had planned to run mine down a couple days ago to see but forgot and plugged it in at night. Perhaps I can give it a go tonight.
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It was 10% for me last night. Will see if it is the same tonight. Am at 30% right now