yes and the charging seems to be slower too

 

Not likely with the S3 because LiIon technology remains the same now, while phones keep getting higher resolution, bigger screens, and thinner!! Will only get better if the battery is bigger.

 

my battery life was horrific after the update. I used to get around 30 hours on GB which plummeted to around 10 on ICS. I dumped beautiful widgets and stopped GTalk logging on as they seemed to be keeping the OS awake. This seemed to improve things with keep awake times significantly reduced. Now with 7 days in to the upgrade it has been on for 24 hours with 50% remaining so am now please with the battery life. Not Sure I dare reintroduce the offending articles to see if wake times increase again but might get brave soon.

 

Hey, had the same problem. Batery got very weak after update, cardged 7 h, lasted 3 h. Now it's normal , maybe better now. Got message to cardge the phone, still can last a whole night and be working in the morning. Maybe it would fix automaticly for you, but if that not, you can try what tryed. Discardge phone to a miniumum, then turn off, plug and cardge to maximum, take out the battery, wait a minute and then put it back on and turn on. I have also tryed hard reset. Don't know what metod helped.

 

try this link some tips to save battery life

[TIPS][GB & ICS] Battery Saving TIPS Collection

 

I'm experiencing too a faster battery drain with ICS 4.0.3, this with stock rom and kernel, and also with stock rom and Siyah Kernel

 

I went from using 100% of my battery per day with Gingerbread, to 200% with ICS (2 recharges a day!), but after a factory reset I'm down to 25% per day!
I've reinstalled most of my apps, so I'm not sure what the issue was, but it's all good now. (Pity I can't cancel my order for a Power Case)
Oh and it seems to charge much faster too.

 

I've found out that the Facebook app is taking up alot of CPU power even when its just in the background. Now I just shut the app down completely and my battery lasts longer now.