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It won't have any effect at all, not even a minor one. Trust me; I've been a "battery hobbyist" for nearly a decade now. Lithium-Polymer and Lithium Ion batteries have no memory effect whatsoever; these warnings and advice that you're reading are a carryover from previous battery chemistries where it was good to be do several full drain/recharge cycles.
Lithium Ion, in fact, is actually very bad to do a full discharge and it will reduce the capacity of your battery. 4.2v is full charge for lithium ion/Lithium Polymer, and there is a protection circuit built into the battery somewhere around 2.4-2.7v. Once that threshold of discharge is reached, the battery will cut itself off to prevent even worse damage. This is the point where you have "0%" battery life left on the phone. It's much better to charge your phone frequently than to do full charges and discharges - it will keep your battery in much better shape.
I even go so far as to have special hobby chargers with perfect algorithms to charge my loose lithium ion cells for my flashlights!


Apr 29, 2010 7:42 AM On FedEx vehicle for delivery
so far the waiting makes this a horrible day. At least it will get a lot better...