Happy owner of the original iPhone since they were introduced and never had a bit of problem. My usage pattern is pretty stable and on the whole I'd get two days before having to recharge. Installed v2.0 and battery life drops to almost half what I was getting. My usage pattern hasn't changed. Only difference in settings (that I know of) is "push". I'm a mac, oops, mobileme user and have "push" turned on for mail and calendar. To date, I've ... 1. Completely drained and recharged my battery three days straight using wall outlet (up till now alway sync-ed and then charged connected to Mac), 2. Every morning (after charge) completely reboot (Home & On switch), No change. Tomorrow after overnight charge I'm going to turn off push and go back to fetch setting to see if that's the problem. Although I thought push lessen battery usage when compared to fetch. Any thoughts or is anyone else seeing this?