Well since I've got exactly 2 battery cycles on my new iPhone I can't say what's best, but I've been draining the battery all the way till it shuts off on me then charging it up. Usually I'm also syncing it with my computer so it turns on too for the charge. To track your battery usage you can go to Settings>General>Usage. So far with this charge I have 2h 42m, standby for 1day 1 hour, and 32 minutes call time... Hmm maybe I should start tracking that... 🙂