I'm starting to wonder about the need for Juice Defender at all. I documented an issue I am having in another post with a failure of my phone to wake up from standby without a battery pull. I have a sneaking suspicion it has something to do with JD, so I have disabled it for a couple of days to see if I have another wake-up episode. Right now I am on 27 hours and at 30%. My screen on time is at 2 hours and change...admittedly low for a Friday/Saturday for me...but I still have 30% left, and NO juice defender on. I have about 1 hour of call time right now. I'm going to let it run down and see how far a calibrated battery can go on this...a couple of things...I keep my screen brightness down fairly low when not out driving around...I'm currently at just about 30% brightness and I go up to about 50% when driving to fight sun washout. I make sure before I leave the house to shut down wifi. That's about it. First thing to check when you are looking for great battery life on this phone is to put it in standby and don't use it for an hour. You should lose no more than 1% per hour in a well performing, well behaved phone. If you are losing more than that, there is something wrong, and you need to find the offending app. I have gps on by the way...but no pushed mail, I check my accounts manually when I want to see email. That's my 2 cents...ymmv.