i've been reading through some battery threads and have seen lots of discussion but can't seem to get a grip on the overall consensus. can anyone provide a definitive guide to calibrating the iphone 3G battery and how to get the most battery life? (battery only, not turning off 3G, etc) i read frequent charges for li-ion are better for full discharges, but for the first time should i let it die down all the way or what? do i need to let it fully discharge every 30 days like i've read you should do for laptops, or is this not the case w/ the iphone? thanks!