Originally Posted by dapheel
I called Samsung Support and they helped me to change the wifi sleep policy from "never" to "when screen turns off". I will let you know if this results in a resolution to battery drain issue. It sounds like it will fix it.
2. Wireless and Network
3. Wifi Settings
4. Click Menu Button (next to Home Button) and Select Advanced
5. Select Wi-Fi sleep policy
6. Change it from "Never" to either "Never when plugged in" or "When Screen turns off".
Update - I went to bed last night before midnight with this setting with battery at 70% and this morning at 8am the battery was at 64%. Since it only used 6% over 8 hours, this worked for me. I have a GS2.
I agree with the people stating that it will use up more of your data package with your carrier. I'm going to review my data usage for the last 2 months to see how much hspa+ data it was using during the night before update to 2.3.6, after update to 2.3.6, and last night.