I just got my two new Motorola Droids almost a month ago and one of them has been having a serious battery issue. I found out about the Droid's battery life being "so-so" to "alright" when the proper apps to kill background applications are set up. But this was no help. I did many experiments on this phone to see what was the problem.
I charged both phones to 100% and switched batteries. In the morning, the phone in question was at 50%, regardless of what battery was in it. So somehow, overnight, while the phone is off, it drains the battery . My last resort is to do a factory reset, but seeing as it only changes system settings and deletes downloaded apps plus a few others, I don't know what to do.
The other phone works wonderful by the way.