Do not let your phone's lithium ion battery die completely! This is extremely bad for the battery. Lithium Ion batteries DO NOT have a memory (unlike previous NiCa batteries). It does not matter to pre-charge the battery. Charge the phone exactly how long the tag on the USB cable says. Do not overcharge your battery.
Quote:
A lithium-ion battery provides 300-500 discharge/charge cycles. The battery prefers a partial rather than a full discharge. Frequent full discharges should be avoided when possible. Instead, charge the battery more often or use a larger battery. There is no concern of memory when applying unscheduled charges.
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Source:
http://www.batteryuniversity.com/parttwo-34.htm