IOS-5 battery power drain issue

Here we go. The solution is below. Hope it will work for you too!

1- Delete your email account(s) in Settings > Mail, Contacts, Calendars > Your Account > Delete Account

2- Reset Network Settings in Settings > Reset > Reset Network Settings

3- Reboot your phone by holding the sleep/wake (top) button then sliding to off.

4- Re-add the email account Settings > Mail, Contacts, Calendars > Add Account…

5- Turn push back on