I have read the official battery guide and it see its similar to a laptop. 300 Cycles for laptop 400 for iPhone My understanding is, 20%, then charge, 20%, then charge, 20%, then charge, 20%, then charge, 20%, then charge, = 100% = 1 CYCLE and to plug it in (LAPTOP) when near a plug to keep cycle count down. Anyway, on the apple forum, opinions vary, some say to wait until you get the 20% warning, then charge it, well, I did that day and got 10 hours of use, internet, voice, on edge though...tonight trying 3G, SO what is the best way, is it like a laptop, charge when possible or let it drain?!?! PLEASE advise! Thanks. You can read the debates at apple discussions.