Had my notebook about a month. At first I was very concerned about battery life. Switched over ti the Note from an iphone 4. I have to say the battery life has improved with time.
Also, in the past week I have implemented a few changes which have helped tremendously.
1. Turn off the notifications you don't care about. Facebook, drippler, pulse, etc. Alot of apps install themself with notifications on. If you're like me and working when those notifications pop up and you wind up clearing them anyway, open the app and turn them if in the settings menu. I'm gonna check all those apps periodically during the day anyway.
2. I too have multiple email accounts. My main accounts I have them sync every 30 minutes. My other accounts (I have 8 running) I have sync either every 6 hours or once a day, depending on how important they are.
3. Last but not least, take screen brightness OFF AUTO!! This will save you a ton of battery. You can always swipe your finger across the top of the screen to raise or lower the brightness.
I pulled my note off the charger at 6 am today. I am a heavy user. Today I listened to music for 4 1/2 hours as well as several hours browsing with normal talk (10-15 calls) and texts (about 50). It's 10:20 pm now and I am at 24%.
Good luck to you, hope this helps out with your battery life.