I agree with the big battery, and here is how I use it. When at home and around the house I use the Big battery, when I go out, it is ALWAYS the slim battery. (I have the desktop charger so charging spare batteries is easy). I have (2) big batteries, so one lives full charged in the car as a backup and the other is in the house (I rotate these every 2 weeks). I also have the car charger, so when driving, it is easy to leave phone plugged in. I have only had to go to the big battery OUTSIDE the house ONCE... That was when I was in the hospital visiting a dying friend, and while in the waiting room, I wated TV via ORB and my Media Center.
Don't know if that helps anyone, but agian...
Just my 2 cents..
