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Yeah, I had some battery-related issues the first time I updated to JB (or at least I thought I had). After a full-wipe and reinstall (and waiting few days to make sure it's settled down) I must say I have no problems any more. In fact, the more I use it the longer the battery seems to last
You need an ICS bootloader, ICS clockwork (version C) and obviously ICS ROM. I don't remember the exact procedure, but it goes like that:
1. Install ROM using clockwork version d (JB one) - at that time it won't boot.
2. Install ICS bootloader - should boot now, but clockwork won't work anymore.
3. Go to fastboot and flash older clockwork (version C).
ICS Bootloader (courtesy of mcl630): https://dl.dropbox.com/u/108997228/A2109A_ICSBootloader.zip
Two other files are posted in other threads.