I would just take the plunge and root already and flash a custom ROM if I were u (i suggest Gingeritus or BAMF). You get so much more out of the phone anyway. Basic step by step institutions are out there that make the process so much easier. But from what I can tell, people get their phone used to the battery through a process of charging and draining. There's info out there and everyone seems to do it differently, so I don't know. This threads just been BAMFed!