A little background: I have been a Motorola Droid (1) user since shortly after it was first released. I have rooted/unrooted, installed ROMs, tinkered with CPU settings, etc. In other words, I know what I'm doing at least to a degree.
Two days ago, my fiance joined my wireless plan and got her first ever smartphone--a Droid X. Since then, she has been having crazy bad battery life. The phone is new out of the box, with a new battery. On the first full day she had the phone, after being plugged in charging all night, the battery was down to 15% by something like 1 p.m. She hadn't really used the phone much at all. Same story today--literally completely dead already by about 2:30 p.m.
Yesterday, I had her check battery usage, and 81% or something was being used by Android System. Again, let me reiterate: the majority of the hours were idle, she hardly used the phone at all. Knowing my phone very well, I've found that on days of moderate to low usage, Display, Phone idle, and Cell standby are generally the highest users of battery, with Android System usually next.
She's frustrated, not nearly as savvy as I am with the phone, and ready to simply return it or get a new battery without letting me work with it first. I have explained that a new battery won't help (more than likely). For some reason, Android System is burning up CPU cycles all the time, crushing battery life.
How can I find out specifically what's eating the battery? I assume it's a widget, something syncing constantly, or a broken app. She has not downloaded anything from the market yet.