I have actually wondered this as well. While here at work I usually keep my phone plugged into my computer while I listen to music through Pandora streaming to my BT headset. I rooted a little while back, but just kept stock. While my phone stayed plugged in I never had any issues with my battery life, but last week I flashed to Sapphire 0.8.4 and my battery seems to just drain. I switched back to stock for a while (mostly just to experience the update when it comes out). Now I know I could use SetCPU to adjust it to where the battery wouldn't drain, but I guess I am still such a newbie that I am not sure what the best setting would be, and how to actually set it. I guess I just don't want to mistakenly set it too high and fry my phone. My wife would $#!T since she doesn't want me to root my phone anyway.I have heard people talk about leaving their phone on the dock/charger all the time. On older phones this was not good for the battery. Is the Droid different so you can do this?
the best setting would be on the first page of this thread. Someone posted a picture of their profile settings.
just follow his/her settings. I just used them and they've been working great!