Like several others I noticed my battery usage increase noticeably after doing the initial JI6 (single .TAR file) update with Odin. My battery would go from 100% charge to anywhere between 70 to 80% of full charge overnight - with no usage, just sitting on standby. I then tried switching from 3G to 2G (WCDMA to GSM respectively) over the same time period and everything went back to normal. The Vibrant would start at 100% at 8 or 9PM and by 7AM it would be at 92 to 93% after 10 or 11 hours which was identical to my pre-JI6 experience. During the day I would switch back to auto network mode and my battery usage (not just on standby) was consistent with my pre-update usage. Here I would be using the voice calling, GPS/maps, messaging, emails, video, camera and even a game or two. Then at the request of another forum member here, I experimented with Odin and the 2 file (.PIT and .TAR files) JI6 update in an attempt to fix the Market issue where some apps weren't visible. This update did repair that issue as I reported in another thread. I don't know if this update has anything to do with the latest battery usage experience but I mention it only in passing as I'm trying to figure this out. Yesterday, I went back to Auto Mode for 3G/2G which normally ate up my battery much faster, charged the phone up to 100% and left it overnight. This morning 9 hours later the battery remains at 100%. I park my phone in a room that previously had spotty 3G coverage. I would get between 0 and 3 bars for 3G and mostly 1 or 2. Strangely, this morning I had 4 bars on my 3G connection. I'm not sure how significant this is or if the coverage has improved here or not. Time will tell. As I've mentioned before, other than the display, seeking a 3G tower connection in a spotty or fringe 3G area I played around with Web and a few other things to make sure it was really still at full charge and not an anomaly, and after about 3 minutes it dropped to 99%. I don't know how significant this is after one event, but I will keep the thread posted with results. One thing is clear though and that is that battery drain can vary from unit to unit and it may have something to do with the way the phone has been updated and or set up. Maybe something as simple as re-updating or doing a factory reset might help those who are having problems.